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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. By 2018 all patents on the original process world ...

3. Silicon carbide - Wikipedia

   en.wikipedia.org/wiki/Silicon_carbide

   Moissanite is similar to diamond in several important respects: it is transparent and hard (9–9.5 on the Mohs scale, compared to 10 for diamond), with a refractive index between 2.65 and 2.69 (compared to 2.42 for diamond). Moissanite is somewhat harder than common cubic zirconia. Unlike diamond, moissanite can be strongly birefringent.

4. Diamond cutting - Wikipedia

   en.wikipedia.org/wiki/Diamond_cutting

   Diamond cutting is the practice of shaping a diamond from a rough stone into a faceted gem. Cutting diamonds requires specialized knowledge, tools, equipment, and techniques because of its extreme difficulty. The first guild of diamond cutters and polishers (Diamantaire) was formed in 1375 in Nuremberg, Germany, [1] and led to the development ...

5. How Much Is a Diamond Worth? How To Find the Value of ... - AOL

   www.aol.com/finance/much-diamond-worth-value...

   The weight of a diamond is one of these variables that determines a diamond’s worth and is what the general public is most familiar with. The unit of measurement, called the carat, equals 200 ...

6. Lonsdaleite - Wikipedia

   en.wikipedia.org/wiki/Lonsdaleite

   Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice, as opposed to the cubical lattice of conventional diamond. It is found in nature in meteorite debris; when meteors containing graphite strike the Earth, the immense heat and ...

7. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   In diamonds, the cut is the primary determinant of value, followed by clarity and color. An ideally cut diamond will sparkle, to break down light into its constituent rainbow colors (dispersion), chop it up into bright little pieces (scintillation), and deliver it to the eye (brilliance).