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2. Moissanite - Wikipedia

   en.wikipedia.org/wiki/Moissanite

   A moissanite engagement ring Moissanite: emerald cut Moissanite was introduced to the jewelry market as a diamond alternative in 1998 after Charles & Colvard (formerly known as C3 Inc.) received patents to create and market lab-grown silicon carbide gemstones, becoming the first firm to do so.

3. Yogo sapphire - Wikipedia

   en.wikipedia.org/wiki/Yogo_sapphire

   A 0.19-carat (0.038 g) diamond cut cornflower blue Yogo sapphire ... the life-size Tiffany Iris ... to a 1984 Los Angeles Times article that described the ring as a 9 ...

4. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   Fancy-colored diamonds such as the deep-blue Hope Diamond are among the most valuable and sought-after diamonds in the world. In 2009, a 7-carat (1.4 g) blue diamond fetched the then highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (US$9.5 million at the time) which is in excess of US$1.3 ...

5. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   The karat (US spelling, symbol k or Kt) or carat (UK spelling, symbol c or Ct) [17] [18] is a fractional measure of purity for gold alloys, in parts fine per 24 parts whole. The karat system is a standard adopted by US federal law.

6. Diamond (gemstone) - Wikipedia

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

   Since the per carat price of diamond shifts around key milestones (such as 1.00 carat (200 mg)), many one-carat diamonds are the result of compromising cut for carat. Some jewelry experts advise consumers to buy a 0.99-carat (198 mg) diamond for its better price or buy a 1.10-carat (220 mg) diamond for its better cut, avoiding a 1.00-carat (200 ...

7. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   Scientifically called "blue zoisite", the gemstone was renamed as tanzanite by Henry B. Platt, a great-grandson of Louis Comfort Tiffany and a vice president of Tiffany & Co., [17] who wanted to capitalize on the rarity and single location of the gem and thought that "blue zoisite" (which might be pronounced like "blue suicide") would not sell ...