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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. Synthetic diamond - Wikipedia

    en.wikipedia.org/wiki/Synthetic_diamond

    Lab-grown diamonds of various colors grown by the high-pressure-and-temperature technique. A synthetic diamond or laboratory-grown diamond (LGD), also called a lab-grown diamond, [1] laboratory-created, man-made, artisan-created, artificial, synthetic, or cultured diamond, is a diamond that is produced in a controlled technological process (in contrast to naturally formed diamond, which is ...

  4. Are lab-grown diamonds 'worthless'? Experts weigh in as ... - AOL

    www.aol.com/news/lab-grown-diamonds-worthless...

    The average cost of a diamond engagement ring in 2024 is around $6,000. ... Producing one carat of lab-grown diamond releases more than three times as much greenhouse gas as mining one carat of a ...

  5. Engagement ring - Wikipedia

    en.wikipedia.org/wiki/Engagement_ring

    Ultimately, the De Beers campaign sought to persuade the consumer that an engagement ring is indispensable, and that a diamond is the only acceptable stone for an engagement ring. [33] The sales of diamonds in the United States rose from $23 million to $2.1 billion between 1939 and 1979.

  6. Cubic zirconia - Wikipedia

    en.wikipedia.org/wiki/Cubic_zirconia

    This property can also be exploited, for example, by dropping the stones in a heavy liquid and comparing their relative rates of descent: diamond will sink more slowly than CZ. [13] Refractive index: cubic zirconia has a refractive index of 2.15–2.18, compared to a diamond's 2.42. This has led to the development of other immersion techniques ...

  7. Diamond - Wikipedia

    en.wikipedia.org/wiki/Diamond

    Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are its mass in carats (a carat being equal to 0.2 grams), cut (quality of the cut is graded according to proportions, symmetry and polish), color (how close to white or colorless; for fancy diamonds how intense is its hue ...

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