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2. Cubic zirconia - Wikipedia

   en.wikipedia.org/wiki/Cubic_zirconia

   Cubic zirconia is relatively hard, 8–8.5 on the Mohs scale —slightly harder than most semi-precious natural gems. [1] Its refractive index is high at 2.15–2.18 (compared to 2.42 for diamonds) and its luster is Adamantine lustre. Its dispersion is very high at 0.058–0.066, exceeding that of diamond (0.044). Cubic zirconia has no cleavage ...

3. Blue Nile (company) - Wikipedia

   en.wikipedia.org/wiki/Blue_Nile_(company)

   In 2015, Blue Nile reported net sales of US$473 million and net income of US$9.7 million. Blue Nile promotes itself as a supplier of ethically sourced diamonds and endorses a zero-tolerance policy towards conflict diamonds. In the summer of 2015, Blue Nile opened their first showroom at Roosevelt Field Mall on Long Island, New York.

4. Zircon - Wikipedia

   en.wikipedia.org/wiki/Zircon

   Zircon ( / ˈzɜːrkɒn, - kən /) [7] [8] [9] is a mineral belonging to the group of nesosilicates and is a source of the metal zirconium. Its chemical name is zirconium (IV) silicate, and its corresponding chemical formula is Zr SiO 4. An empirical formula showing some of the range of substitution in zircon is (Zr 1–y, REE y ) (SiO 4) 1–x ...

5. 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 ...

6. Diamond - Wikipedia

   en.wikipedia.org/wiki/Diamond

   Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond as a form of carbon is a tasteless, odourless, strong, and brittle solid that is transparent in colour, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the ...

7. Lapis lazuli - Wikipedia

   en.wikipedia.org/wiki/Lapis_Lazuli

   Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.