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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 ...
The hardness (8–8.5), RI (2.15–2.18, isotropic), dispersion (0.058–0.066), and low material cost make CZ the most popular simulant of diamond. Its optical and physical constants are however variable, owing to the different stabilizers used by different producers. There are many formulations of stabilized cubic zirconia.
Demantoid also has a high refractive index of 1.80 to 1.89. Demantoids are generally small, with finished stones generally under 1 carat (200 mg) and stones over 2 carats (400 mg) are rare. Stones over 3 carats (600 mg) are very rare.
Jean Dousset. Both Neal and Dousset have observed that bigger stones—specifically, diamonds—are trending. Dousset noted sizes as large as three or four carats, saying that the popularity of ...
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Found all over the world, the industry of coloured gemstones (i.e. anything other than diamonds) is currently estimated at US$1.55 billion as of 2023 and is projected to steadily increase to a value of $4.46 billion by 2033.