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2. 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 ...

3. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   It was noted that "coatings in particular are not considered permanent", and in the United States are required to be disclosed at the point of sale. Pleochroism in tanzanite. Pleochroism has a physical property in which the gemstone will appear to have multiple colours based on the angle of the light hitting the stone. Tanzanite is a pleochroic ...

4. Blue John (mineral) - Wikipedia

   en.wikipedia.org/wiki/Blue_John_(mineral)

   Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire. During the 19th century, it was mined for its ornamental value, and mining continues on a ...

5. List of jewellery types - Wikipedia

   en.wikipedia.org/wiki/List_of_jewellery_types

   Celibacy vow ring; Medical alert jewelry; Membership pin ... Prayer beads; Prayer rope; Rosary beads; Puzzle jewelry. Puzzle ring; Signet ring; Thumb ring; Gemstone ...

6. Amethyst - Wikipedia

   en.wikipedia.org/wiki/Amethyst

   Amethyst is a violet variety of quartz. The name comes from the Koine Greek αμέθυστος amethystos from α- a-, "not" and μεθύσκω ( Ancient Greek) methysko / μεθώ metho ( Modern Greek ), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. [1] Ancient Greeks wore amethyst and carved ...

7. Tiffany & Co. - Wikipedia

   en.wikipedia.org/wiki/Tiffany_&_Co.

   Tiffany & Company, Union Square, Manhattan, storage area with porcelain, c. 1887. Tiffany & Co. was founded in 1837 by Charles Lewis Tiffany and John B. Young, [15] in New York City, as a "stationery and fancy goods emporium", with the help of Charles Tiffany's father, who financed the store for only $1,000 with profits from a cotton mill. [16 ...