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2. Tiffany & Co. - Wikipedia

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

   Tiffany is known for its luxury goods, particularly its diamond and sterling silver jewelry. [101][102][103][104] George Frederick Kunz (1856–1932), a Tiffany gemologist, became instrumental in the international adoption of the metric carat as a weight standard for gems.

3. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   Diamond[a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and desirable as jewelry. Diamonds are such a highly traded ...

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...

5. Gemological Institute of America - Wikipedia

   en.wikipedia.org/wiki/Gemological_Institute_of...

   The Gemological Institute of America (GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [1] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. The institute does so through research, gem ...

6. Star of Bombay - Wikipedia

   en.wikipedia.org/wiki/Star_of_Bombay

   The Star of Bombay is a 182- carat (36.4-g) cabochon -cut star sapphire originating in Sri Lanka. The violet-blue gem was given to silent film actress Mary Pickford by her husband, Douglas Fairbanks. She bequeathed it to the Smithsonian Institution.

7. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   A–B Actinolite Nephrite (var.) Adamite Aegirine Afghanite Agrellite Algodonite Alunite Amblygonite Analcime Anatase Andalusite Chiastolite Andesine Anglesite Anhydrite Annabergite Anorthite Antigorite Bowenite Apatite Apophyllite Aragonite Arfvedsonite Asbestos Astrophyllite Atacamite Augelite Austinite Axinite group: Ferroaxinite Magnesioaxinite Manganaxinite Tinzenite Azurmalachite Azurite ...