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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. Diamond cut - Wikipedia

    en.wikipedia.org/wiki/Diamond_cut

    This cut's design can be considered the opposite of the hearts and arrows, as it eliminates the arrows in order to capture a different light return from the center of the diamond. The cut splits the eight pavilion mains and increases the specifically-placed total facets from 57 to 81. The cut was designed to enhance brilliance and mask inclusions.

  4. Cutting ring fitting - Wikipedia

    en.wikipedia.org/wiki/Cutting_ring_fitting

    The cutting ring fitting consists of the body, the cutting ring and the nut. On assembly, the two cutting edges of the cutting ring carves into the outer surface of the tube hence ensuring the necessary holding power and sealing for high operating pressures. [1] The tubes have usually metric dimensions.

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