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A Brief History of Gemstone Writings
16th Century Plate - Lapidus.

A Brief History of Gemstone Writings

from Gems in Myth, Legend and Lore by Bruce G. KnuthReferences to gemstones appear in many ancient writings. They may be mentioned as decoration, a means of barter, a symbol of wealth,…

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A History of Diamond Cutting
Antique Cushion Cut Diamond Ring.

A History of Diamond Cutting

You shall make a breastpiece of judgment, in skilled work. In the style of the ephod you shall make it—of gold, blue and purple and scarlet yarns, and fine twined…

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A History of Silver in Jewelry
Danish Sterling Silver Flower Bracelet.

A History of Silver in Jewelry

Silver is a white metallic element, harder than gold, softer than copper and second only to gold in malleability and ductility. Represented on the Periodic Table of the Elements by the symbol Ag, silver is an…

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À jour
Close-Up of À jour (Brooch Reverse).

À jour

À jour (from French: jour = day) is a term used in gem setting to describe open-worked backgrounds, created by sawing or piercing, that keep the stone back open “to the day.”…

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Accessoire
Tiffany & Co. Miniature Perfumer in 14K Yellow Gold, c.1970s.

Accessoire

Accessoires (or accessories) are items which men or women wear or carry with them that have a purpose. Historically these were utensils or nécessaire that were suspended from a châtelaine or a watch chain and often were…

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Acus
Collection of Romano-British Era Bone and Silver Hairpins (Acus Crinalis). © The Trustees of the British Museum.

Acus

An acus is a Roman pin originally designed to secure a hairstyle (acus crinalis). They measure 6 to 9 inches in length and are made of gold, silver, bone, wood,…

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Adamantine Luster
6.79 Carat French-Cut Diamond, Angled View.

Adamantine Luster

Adamantine is the term used to describe the luster exhibited by diamonds and gems with a Refractive Index of 1.9 – 2.5. The root word adamant derives from the Greek word adamastos which means untameable. Throughout history the…

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Addorsed
Castellani Mark with Addorsed C's. c.1880. Image Courtesy of Wartski.

Addorsed

From the French adosse, to lean, addorsed is a term that is applied to a motif with animals or objects placed back to back. Often observed in heraldic designs where lions,…

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Adularescence
Raymond Yard Retro Moonstone and Sapphire Jewelry Suite.

Adularescence

Adularescence is an optical phenomena often called the “moonstone” effect. The phenomenon is applied to feldspar, usually orthoclase that, when cut as a cabochon, exhibits a floating, billowy bluish or…

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Aesthetic Period: 1885-1901
Late Victorian Belt Buckle.

Aesthetic Period: 1885-1901

The Aesthetic Period of Victorian jewelry can be defined as one of reaction against previous jewelry periods. Victorians became disillusioned with fashions and furnishings and sought a way out of…

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Agate
Banded Agate and Seed Pearl Victorian Brooch.

Agate

Agate is a variety of chalcedony found in many different colors and degrees of translucency. There are several varieties of agate named after their location of origin or physical characteristics.…

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Aggregate
Lapis Lazuli Aggregate.

Aggregate

Aggregate in the geologic or gemologic sense of the word, is defined as a composition of various materials (usually mineralogical and chemical) brought together by processes within the earth to…

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