Showing posts with label DIAMOND. Show all posts
Showing posts with label DIAMOND. Show all posts

Thursday, 20 October 2011

A MAGNIFICENT FANCY VIVID BLUE DIAMOND.


A MAGNIFICENT FANCY VIVID BLUE DIAMOND.
Set with a modified pear-shaped fancy vivid blue diamond weighing 12.02 carats to the tapered baguette-cut shoulders and 18k white gold hoop. With certificate 11568233 dated 19 June 2001 from the Gemological Institute of America stating that the diamond is fancy vivid blue, natural color, VVS2 clarity. 


Historically, blue diamonds originated from the Kollur mines near Golconda in the Indian state of Hyderabad. It is here that historically important stones such as the Hope Diamond and the Tereschenko were mined. Most of what is known about early mining activity in India comes through the 17th century traveler and one of the premier gem-merchants of his time, Jean-Baptiste Tavernier. 


His main client was Louis XIV and it is known that he sold to the King a very large blue diamond known as the French Blue which is thought to have yielded the Hope; it is here that the history of blue diamonds began. These Indian deposits have now been worked out and so nearly all the blue diamonds that now appear on the market come from the Premier Mine near Pretoria in South Africa. 


Natural blue diamonds are among the rarest of colored diamonds and their color comes from the presence of minute amounts of the element boron incorporated within the crystal lattice of the stone during its crystallization process. They belong to the extremely rare Type IIB category of diamonds and are semi-conductors of electricity; an attribute which makes them unique amongst other diamonds. 


The pear-shaped diamond of 12.02 carats offered here is part of a very elite group of remarkable blue diamonds offered at auction and has been awarded the highest color grade of VIVID by the GIA. Furthermore it is to date the largest vivid blue diamond to appear at auction making it a highly rare and collectible gem." 


The stone did not sell. Christies was predicting it to go for between $5 and $6 million U.S. dollars. I contacted Christies.com and asked them about the stone, they told me that the owner does not plan to put it back up for auction in the foreseeable future. 

About Diamond Certificates


About Diamond Certificates


A diamond grading certificate is a report given by an independent and professional gemological laboratory. The diamond is evaluated for its quality, not its value. Every diamond is unique. The certificate will map out all the diamond's recognizable and individual characteristics. Each certificate will include the diamond's color, clarity, carat weight and cut information (see the 4 C's of quality). The grading report also includes a hand-drawn map of the diamond's inclusions. Since no two diamonds are exactly alike you can always check that the certificate matches the diamond. 


There are dozens of gemological laboratories handing out certificates but only a few are respected by the diamond trade. Some well-known laboratories include the European Gemological Laboratories (EGL) and the Gemological Institute of America known as GIA 


To better understand your certificates here are some commonly used terms 


Stone ID: A Unique number representing your diamond. This number is registered in a global database. 


Date: The date the report was issued. 


Cut and Shape: Shapes other than the standard round brilliant are called fancy shapes or fancy cuts. Their names are based on their shapes. The best known are the heart, marquise, pear-shaped cut, emerald cut, princess cut, oval, and radiant. 


Dimensions: The dimensions of the diamond are stated as "largest diameter - smallest diameter X depth" for round shapes and "length X width X depth" for other shapes. 


Carat Weight: The standard unit of weight used for gemstones. One carat equals .200 grams (or 200 milligrams). Usually abbreviated ct. 


Graining: Graining and grain lines reflect irregularities in the crystal structure. Colorless graining usually does not affect the clarity grade; but white, colored, or reflective graining does. 


Proportions: Proportion refers to the angles and relative measurements of a polished diamond. More than any other feature, proportions determine a diamond's optical properties. Studies have shown that table size, crown angle, and pavilion depth have a dramatic effect on a diamond's appearance. 


Depth%: The depth of the diamond divided by the average diameter for rounds, or the depth divided by the width of the diamond for other shapes. 


Table%: The average size of the table facet divided by the average diameter of the diamond for round shapes, or the width of the diamond for other shapes. 


Girdle: The girdle is the outside edge of the outline of the diamond. The certificate indicates the thickness of the girdle relative to the size of the diamond, and the condition either polished or faceted. 


Culet: The point at the bottom of the diamond. If the culet is faceted then the certificate indicates the size of the facet relative to the size of the diamond. 


Finish: Finish grades represent the quality of the diamond's surface condition (polish), and the size, shape and placement of the facets, including the evenness of the outline (symmetry). 


Polish: Indicates the care taken by the cutter in shaping and faceting the rough stone into a finished and polished diamond. 


Symmetry: A diamond's symmetry is the arrangement of the facets and finished angles, created by the diamond cutter. Excellent symmetry of a well-cut and well-proportioned diamond can have a great effect on the diamond's brilliance and fire. Grading reports will often state the diamond's symmetry in terms of Excellent, Very good, Good, Fair, or Poor. 


Cut: The proportions and finish of the diamond. With the proper proportions, most of the light that enters a diamond is returned revealing the diamond's brilliance and fire. Any deviation of these proportions will compromise the beauty of the stone. 


Clarity: Clarity represents the relative absence of inclusions and blemishes in the diamond. Clarity is graded under 10X magnification from Flawless to Included based on the size, nature, position and quantity of the diamond's inclusions. 


Color: Assesses to an obvious yellow (Z) when compared to Master Color diamonds. 


Pavillion Depth: The distance from the bottom of the girdle to the culet is the pavilion depth. A pavilion depth that is too shallow or too deep will allow light to escape from the side of the stone, or leak out of the bottom. A well-cut diamond will direct more light through the crown. 


Tolkowsky Ideal Cut: In the 1920's a Russian Mathematician by the name of Marcel Tolkowsky calculated the proportions of the facets in a round diamond that would bring an ideal balance between brilliance and dispersion. Any deviation from these designs will compromise the beauty of the stone. 


Fluorescence: When exposed to ultraviolet light, a diamond may exhibit a more whitish, yellowish or bluish tint, which may imply that the diamond has a property called fluorescence. The untrained eye can rarely see the effects of fluorescence. Diamond grading reports often state whether a diamond has fluorescent properties. Fluorescence is not considered a grading factor, only a characteristic of that particular diamond. 


Crown Height: The crown is the upper portion or the top of a diamond. 


Diagram: A diagram approximates the shape and cutting style of the diamond. Symbols on the diagram include the type, nature, position and approximate size of a clarity characteristic. 


Key to Symbols: Lists the characteristics and symbols shown on the diagram, if present. Remember, a diamond grading certificate from a leading gemological laboratory will insure you get the quality you paid for.

Diamond Clarity



Diamond clarity is the most important thing to consider if you’re thinking about purchasing a diamond. However, it can be challenging to get high quality diamonds, especially if you don’t know much about them. Before you go out and purchase a diamond, you should read this guide to make sure you don’t get stuck with an over-priced, low quality rock. 


What to look for 


When shopping for jewelry, whether it is gold or silver, keep in mind that price is always of primary concern. As a general rule, the price of a particular piece defines how good it is. You should always be wary of cheap jewelry when shopping for someone close to you, as they make it cheap for a reason. 


Additionally, you should be cautious of buying jewelry that is on sale. Sometimes jewelers put certain pieces on sale because they simply want to get rid of old stock. At other times, however, they put pieces on sale because they are of low quality. 


Finally, pay close attention to how well the diamond is cut. The more the diamond has been cut and formed, the better it is. 


Where to shop 


It is of the utmost importance to shop for diamonds from a reputable dealer. This point cannot be stressed enough. When you are planning to spend a significant amount of money on jewelry, you want to make sure that you are getting something that is worth the asking price. 


A good way to gauge whether or not you can trust a jeweler is to look around their shop. If they have a high-quality, professional establishment then chances are you will be fine. However, if they are running a kiosk, booth, or are just selling their wares on the streets, then you should avoid these types of dealers. 


Additionally, you should trust your instincts. If you have a bad feeling about the person you are doing business with, then don’t do business with them. 


Finally, you should try to shop from the largest store in your community. The reason is that large-scale buyers get the best deals which allow them to pass the savings on to you, the consumer. 


Other Tips 


Whether you’re looking for a simple pendant or an engagement ring, you should buy designer diamond jewelry. These will generally look the best and will allow you to make your gift extra special. Another thing to consider when looking at jewelry designs is that women wear diamonds to be fashionable. You’re going to want to buy something that is both beautiful on its own and complimentary to her fashion style. 


Finally, get a gift that symbolizes your love for the person you are shopping for. If you are spending a massive amount of money on a present, you want that gift to be as special as possible. By following the advice listed here, it is certain that you will find the diamond jewelry you have been looking for.

Fancy Colored Diamonds


Fancy Colored Diamonds: Information On Natural Versus Synthetic Colored Diamonds


If you have been thinking about buying or wishing for a fancy colored diamond read this article first! Colored diamonds are the next big trend in jewelry design. The spectrum of colors is as big as your imagination. Choosing what’s right for you can be overwhelming in today’s diamond market. This article will address a few important factors to consider when buying a fancy colored diamond for yourself or a loved one. Most important is knowing the differences between colored diamonds that are formed naturally and ones that are man-made. 


Natural Fancy Colored Diamonds 
Diamonds colored naturally are very rare and fetch very high prices. There are three ways in which colored diamonds are formed by nature. The first method is when a foreign element is introduced to the carbon material that a diamond is made from. For example, nitrogen can cause a diamond to have yellow or orange hues while boron can make it blue. The second method is when pressure compresses the carbon and creates a red, pink or purple hue. Lastly, natural radiation deep in the earth generates diamonds with colors of green or blue. Green, red and purple diamonds are considered very rare and command high prices. Indeed, there are only six naturally formed red diamonds currently in the market. One can only imagine the prices these stones will fetch. Natural fancy colored diamonds are so rare that there exist at least 10,000 colorless stones for each colored stone. 


Synthetic or Treated Fancy Colored Diamonds 
Fancy colored diamonds can also be man-made in labs. There are a variety of methods used to color diamonds. Some of these stones are purely synthetic, meaning they were totally created in a lab to simulate the properties of a real diamond. They are formed from carbon just like the real thing. However, these stones can be formed in a matter of weeks where as it takes thousands of years for natural diamonds to be formed. These type of synthetic diamonds are so similar to the real thing that only high tech equipment can detect subtle differences in the crystal formations within the stone to know they are fake. 


Another man-made method to produce fancy colored diamonds involves irradiating a natural diamond that possesses an unattractive color. Irradiation is a process in which a diamond is exposed to a source of radiation that changes the position of atoms within the stone thus causing its color to change. 


Treated or synthetic diamonds may look very appealing to the consumer because of the price and uniformity of color; however, these diamonds have no value to the serious buyer and have little resale value. Therefore, if you are purchasing a colored diamond for investment it is vital to obtain certification from the diamond seller. The certificate should come from a reputable laboratory and contain the origin of the stone and the natural origin of the stone’s color. 


Diamond Certification and the Four C’s of Diamond Buying 
Grading colored diamonds presents another set of unique issues for the buyer. Colorless diamonds are graded on the four C’s: Cut, Carat, Clarity and Color. Colored diamonds are also valued based upon the four C’s but another factor weighs most heavily on the value of a fancy colored diamond. This factor is based upon the hue and rarity of the color. Indeed a rare fancy color will garner a much higher price than a colorless diamond of many more carats. Colored diamonds have three characteristics by which they are graded. These are hue, tone and saturation. Hue refers to the dominant color of the stone, tone refers to the light within the stone and saturation refers to the intensity of the hue. Be sure to look for these factors on the diamond certificate. 


Having knowledge about the differences between natural and synthetic colored diamonds will help you to choose the diamond that’s right for you. One thing is certain, in today’s marketplace jewelry designers are using fancy colored diamonds to create beautiful and unique designs that consumers want to own.

Are Diamonds Really Forever?



In the past, the Greeks and the Romans thought that the diamonds were tears of Gods and small pieces of stars. There were also the Hindus, who thought that the diamonds had so much power that they put diamonds in the eyes of some of their statues. Other people believed that an unapproachable valley in Central Asia covered by diamonds existed. One said that this valley was "kept by birds of prey and protected by snakes of mortal stare". 

Besides believing that diamonds could attract luck and success, people also thought that they could defy the astrological events. Many people used them as jewels, supposing they would be increasing their sexual power and capacity to attract. Even Plato wrote about diamonds, describing them as living creatures, impersonating divine spirits. 

Until the 15th century, only kings were allowed to use diamonds, having them as a symbol of courage, power and invincibility. But as the centuries passed by, the diamond started to acquire its status of sublime proof of love. Currently, they are related to the love, romance and myth. 

We probably will never know when the first diamond was discovered, but we do know that, from the ancient times to the 18th century, all the diamonds of the world came from India. From the period of the Roman Empire to the appearance of the first Europeans to India, in the beginning of the 16th century, the commercial relations between Europe and Eastern Asia bloomed. 

One of the main routes of the diamond commerce was in Venice. The city became the most important mercantile republic of the western world. It enjoyed the monopoly of the commerce of the diamond course to the main cities of the south of Germany until its final destiny, Brussels. Since this city became the final phase of the commercial route, it became a promising centre of diamond stature, and the reputation of the city in this sector did not stop increasing. Even though Brussels maintained their predominance until the end of the 14th century, they began to decline in a lapse of fifty years. The diamond trade and numerous other economic activities of Brussels were moved progressively to the city of Ambers, which offered more recent and better facilities for the communications and the commercial exchange. In 1866, the first diamond in South Africa was discovered. Following this was the discovery of the deposits of Kimberley few years later, giving birth to the fabulous era of Kimberley. 

The word diamond comes from the Greek word ' adamas ', meaning invincible, and ' diaphanes ', that means transparent. In the past centuries, people believed that a diamond could reattach a wrecked marriage. It was used also in battles as a symbol of courage. 

Even though the diamond is the hardest rock known by men, it is the only precious gem with only one element: carbon. Nevertheless, it can only be melted when exposed to a temperature of 5500 degrees Celsius! Billions of years before, the basic forces of heat and pressure miraculously transformed the carbon into diamond through volcano lava underneath the earth. In some way, this volcanic mass was expelled out of the earthly crust, cooling soon to be found as diamonds in rudimentary form. No acid can destroy them, and they are capable to cut anything on Earth, therefore, they only can be cut with themselves. 

However, are the diamonds really forever? If they appeared miraculously, can they be destroyed? As incredible as it may seem, the small diamond that adorn the ring that you gave your wife will probably last forever - at least while Earth exists. They are the most resistant minerals of the planet, and only can be melted when displayed to a temperature of 5500°C. The problem is that the global atmosphere will never achieve this high temperature, even if it was to be hit by an enormous meteor that would eliminate all forms of life. They only would melt if, one day, the planet literally entered the Sun, which has a temperature of 5800°C. The curious thing is that, according to astronomers, in 7,5 billion years our planet will actually enter the Sun, when the star will be next to death. If you think diamonds will disappear then, you might be wrong. When such episode happens, the temperature of the Sun will lower to about 3000°C. That means that even when Earth reaches an atmosphere as hot and dense as Mercury’s atmosphere, we will still be able to find some small diamonds spread around.

Friday, 7 October 2011

Attractive Display

Small diamond on the tounge

Black diamond


Fancy shaped



Factors important in selecting a fancy shaped diamond include all of the 4C's as they apply to the round shape. However, additional considerations come into play when considering fancy shapes such as the overall appearance of the outline of the girdle of the stone, the "bow tie" effect and the length-to-width ratio. Finally, one may ask, how does shape affect price? So here we will consider each shape separately and the factors which are important in how they impact beauty and price.


Currently there is no widely accepted "ideal" range of proportions for the fancy shaped diamonds. However, these may be developed in the future because it is known that the American Gem Society is working on this issue (see www.gemappraisers.com for details. This is probably the best classification of cut proportions in fancy shapes currently available

Black and White


EMERALD - The emerald cut is not a brilliant cut, but is called a step cut. Step cuts are comprised of larger, planar facets which act like mirrors. The emerald cut has 58 facets, with 25 crown, 8 girdle and 25 pavilion. Because of the angle, size and shape of the facets, the emerald cut shows less brilliance and fire (dispersion) than the other brilliant and modified brilliant cut diamonds. However, the emerald cut stone reveals a classic and aristocratic elegance and beauty not seen in other cuts.


Because of the open and large, plate-like nature of the facets, it is highly recommended that you consider staying at higher color (D-G) and clarity (IF-VS2) grades than you might with a brilliant cut stone because they are more likely to become visible at lower grades. Also, check to make sure that all the facet edges appear parallel in the face-up position. If they aren't, it can be pretty obvious at times.


The emerald cut offers a touch of regal elegance as the center stone in a ring, and the most attractive proportions are a length-to-width ratio range of 1.50-1.75:1.00. However, some prefer a more square look with a ratio in the range of 1.30:1.00. Obviously, the more square the shape, the more it compliments the longer-fingered hand, and the more rectangular, the better suited it is to the shorter-fingered hand.


The better emerald cut diamonds, like radiants, will have table %'s of about 59-69% and total depth %'s ranging from about 59-69%.


Like both the radiant and princess, the cost of a 1ct., D, IF emerald cut diamond is roughly 33% less than that of an identical round stone, but a 1ct., G, VS2 emerald is only about 20% less than the cost of an identical round.

PRINCESS YELLOW


PRINCESS - The princess cut is called a square/rectangular modified brilliant in GIA grading reports. It may have either 50 facets (21 crown, 4 girdle, 25 pavilion) or 58 facets (21 crown, 4 girdle, 33 pavilion), depending on how the pavilion is cut.


This cut of diamond is frequently a square shape and therefore shortens the appearance of the longer fingered hand. The princess cut has sharp, squared-off corners, and if the girdle is extremely thin in these areas, chipping or cracking may occur more easily.


Princess shapes of high cut quality usually have a table % in the range of roughly 60-75% and a total depth % of about 65-80%.


As with the radiant, the cost of a 1ct., D, IF princess diamond is roughly 33% less than that of an identical round stone, but a 1ct., G, VS2 princess is only about 20% less than the cost of an identical round.

Loos Diamond


In hand


oval mixed cut


There are basically three types of cutting patterns, the brilliant cut, the step cut and the mixed cut (a combination of brilliant and step cuts). Sometimes diamonds with modified cuts are described both as to shape and faceting pattern in order to minimize confusion. For example, an oval shaped stone, which has a brilliant cut crown and a step cut pavilion, might be referred to as a "modified oval" or an "oval mixed cut".


Some of the fancy shapes are better suited for retaining the maximum weight of the more flat forms of diamond rough called macles and flats, and many are also cut from the less perfectly shaped octahedral and dodecahedral crystals. There are many other shapes (trilliant, bagette, etc.) and many branded cutting patterns which occupy specialized niches and more limited market positions, but we will not cover them here.