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Ametrine
Faceted Ametrine.

Ametrine

Ametrine is a variety of quartz consisting of both amethyst and citrine with zones of both purple and yellow. Most naturally occurring ametrine comes from Bolivia, with some from India and Brazil. Differentially heat-treating amethyst…

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Amorphous
An Illustration to Clarify the Difference Between an Amorphous Substance and a Crystalline One. On the Left - Carbon Atoms Arranged Randomly way. There is No Regular Repeating Three Dimensional Array of Atoms Like on the Right. Both Substances are Composed Solely of Carbon Atoms the Arrangement of Atoms Makes a Huge Difference. The Substance on the Left is Amorphous Carbon - Very Soft and Brittle, the Substance on the Right is Diamond - the Hardest Mineral Known.

Amorphous

An amorphous substance is a substance that has no regular arrangement of atoms; it literally means “without form”. Examples of materials and gems that have no regular arrangement of atoms,…

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Amulet
5 Egyptian Blue Glaze Amuletic Figures, c.664-525 BC. Photo Courtesy of Sotheby's.

Amulet

Precious stones have long been associated with symbolism, superstition, mysticism, and medicine. An amulet is a talisman of symbols and or gemstones believed to have specific apotropaic properties (to ward…

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Anchor Chain
Anchor Link Chain with Padlock Clasp.

Anchor Chain

An anchor chain is a cable chain with an additional cross bar. They are named after the metal chains used to raise or lower a ship’s anchor.

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Ancient Jewelry
Mycenaean Gold Earrings c. 13th Century B.C. Photo Courtesy of Christie's.

Ancient Jewelry

Up until 2015, the oldest known objects that were believed to have served a decorative purpose for the human body were approximately 110,000 years old. Drilled shell beads from this time (the…

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Andalusite
Andalusite var. Chiastolite.

Andalusite

The name, Andalusite, is an homage to the city of Andalusia, Spain. Gem-quality examples of this mineral species are somewhat rare. Running the gamut from transparent to opaque, these highly…

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Anklet
Anklet with Alternating Diamond-Set Rosettes and Gem-Set Hinged Lockets (or Caskets), Engraved Designs on the Interior, Calcutta. Image Courtesy of the Victoria & Albert Museum Collection.

Anklet

An anklet is a bracelet worn around the ankle. Like a bracelet an anklet can be a chain suspending beads and charms, a cuff fitting snugly around the ankle, a semi-circle, similar to a torc, or just about…

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Annealing

Annealing is the thermal recrystallization of metal in order to reduce stress caused by work hardening. After the metal is heated, the heat is held for a period of time…

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Anodized
Anodized Metal Parts.

Anodized

Anodized metal is metal on which a conversion coating, composed of a stable oxide, to allow it to accept paint or electroplating, is formed. This coating can also be used…

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Antique
Antique St. Esprit with Olive Branch Diamond Pendant.

Antique

Antique jewelry refers to jewelry of at least 100 years of age.

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