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2. Jewellery chain - Wikipedia

   en.wikipedia.org/wiki/Jewellery_chain

   Jewellery chain. Gold body chain for a slight woman or a girl. Frontal view with an amethyst and four garnets; four other gems are missing (4th or 5th century Romano British, part of the Hoxne hoard) [] Byzantine body chain found as part of the Asyut Treasure, Egypt c. 600 AD (British Museum) [] Gold chain from the sixteenth century, Sweden.

3. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   Gold-filled jewelry. Gold-filled is a type of composite material. Composites are formed from two or more constituent materials with different properties that, when combined, create a new material with enhanced properties. [1] Gold-filled material is made by bonding a layer of gold alloy to a base metal core (typically brass, but sometimes ...

4. Gold - Wikipedia

   en.wikipedia.org/wiki/Gold

   Because of the softness of pure (24k) gold, it is usually alloyed with other metals for use in jewelry, altering its hardness and ductility, melting point, color and other properties. Alloys with lower karat rating, typically 22k, 18k, 14k or 10k, contain higher percentages of copper, silver, palladium or other base metals in the alloy. [27]

5. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [1] but colored gold can come in a variety of different colors by alloying it with different elements. Colored golds can be classified in three groups: [2] Alloys with silver and copper in ...

6. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost ...

7. Napier Company (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Napier_Company_(jewellery)

   Flask, 1925-1930. Sterling silver and cork, 9 5/8 x 4 1/2 x 1 3/16in. (24.4 x 11.4 x 3cm). Brooklyn Museum, Modernism Benefit Fund. The Napier Company is an American jewelry manufacturing company, and was one of the first modern corporations in the United States. The company is also known historically as a cutting-edge silver object manufacturer.