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The smart consumer's diamond buying guide.... |
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Diamond Buying Made Easier > Diamond Glossary > Diamond Glossary- ADiamond Glossary - AGS, AGTA, Asscher Cut Diamond, AppraisalThis is our diamond glossary of terms used in the diamond jewelry business.... facts about diamonds-  Click a letter to view terms - Diamond Glossary - AAbrasion: Tiny nicks along facet edges, usually caused by contact with other diamonds. Producing white fuzzy lines instead of sharp crisp facet edges.Abraded Culet: A culet that has minor abrasions on it. Age: The age of a diamond ranges between 1 billion to 3.3 billion years. Alloy: Combination of 2 or more metals. Alluvial Diamond: A diamond that has been transported by water and deposited in seas, lakes or streambeds. American Cut: Proportions and facet angles of a diamond that were mathematically calculated by Marcel Tolkowsky to produce maximum brilliancy consistent with a high degree of fire in a round brilliant cut diamond and are considered by many to constitute the "Ideal Cut" diamond. These figures, computed as a percentage of the girdle diameter, are as follows: total depth of 59.3% (without provision for girdle thickness); crown height of 16.2% (table 53% and Crown angle of 34.5 degrees); pavilion depth of 43.1% (pavilion angle of 40.5 degrees). American Gem Society (AGS): The American Gem Society was established in 1934 by a select group of independent jewelers and Robert M. Shipley, founder of the prestigious school of gemology, the Gemological Institute of America (GIA). It was their vision to create an association dedicated to setting and maintaining the highest possible standards of business ethics and professionalism in the jewelry industry. Today, American Gem Society members continue their dedication to ethics, knowledge and consumer protection. American Gem Society Laboratory (AGSL): Since 1996, the AGS Laboratories is the world's premier diamond grading laboratory and the only diamond grading laboratory backed by the jewelry industry's premier consumer protection agency, the American Gem Society, and the first prominent diamond grading laboratory to offer diamond grading reports with a Diamond Cut Grade for the round brilliant cut diamonds, princess cut, oval brilliant, and emerald cut diamonds. American Gem Trade Association (AGTA): the American Gem Trade Association and its members are active in all areas, from mines and research labs to wholesale offices, design studios and retail showrooms. As a result, the AGTA is recognized as the voice of the natural colored gemstone and cultured pearl industries. Some of the most significant contributions to the trade have been the creation of the AGTA Code of Ethics and Principles of Fair Business Practices, the Gemstone Enhancement Manual (G.E.M.), along with the opening of the AGTA Gemological Testing Center in New York in October 1998. Anneal: A treatment process of heating and slow cooling of colored gemstones, color enhanced diamonds, and metals. Appraisal: A written estimate of the value of the item described. They can be used for insurance purposes and should be updated every few years. Arkansas Diamond: An Arkansas diamond is actually a rock Quartz crystal. Art Deco: Art Deco was a style popular from the mid-1910's until the late-1920's. This style originated in Paris, France. Geometric lines and angles, with very few curves, characterize Art Deco pieces. The Asscher Cut diamond and the Emerald Cut diamond were developed and became popular during this period. Asscher Cut Diamond: A square step cut diamond named after its inventor, Joseph Asscher. Asscher, Joseph: Joseph Asscher was an eminent diamond cutter who cut the 3,106 carat Cullinan diamond. Asscher worked in Amsterdam. In 1902, his company, the Asscher Diamond Co., developed and patented the Asscher cut, a squarish step cut with an almost octagonal outline. This new cut enhanced the fire and light of the stone; it had a small table, a high crown, wide step facets, a deep pavilion and square culet. This cut became very popular in Art Deco jewelry and was a forerunner of the Emerald Cut diamond. Average Girdle Diameter: The average measurement of the minimum and maximum diameter of a Round Brilliant Cut diamond. |
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