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  2. Synthetic alexandrite - Wikipedia

    en.wikipedia.org/wiki/Synthetic_alexandrite

    Synthetic alexandrite is an artificially grown crystalline variety of chrysoberyl, composed of beryllium aluminum oxide (BeAl 2 O 4). The name is also often used erroneously to describe synthetically-grown corundum that simulates the appearance of alexandrite , but with a different mineral composition.

  3. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    Alexandrite in sizes over three carats are very rare. Today, several labs can produce synthetic lab-grown stones with the same chemical and physical properties as natural alexandrite. Several methods can produce flux-grown alexandrite, Czochralski (or pulled) alexandrite, and hydrothermally-produced alexandrite.

  4. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    However, the latter term is a misnomer: synthetic color-change sapphires are, technically, not synthetic alexandrites but rather alexandrite simulants. This is because genuine alexandrite is a variety of chrysoberyl: not sapphire, but an entirely different mineral from corundum. [22]

  5. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Lab alexandrite; Lab corundum; Cubic zirconia; Lab diamond; Lab emerald; Fordite; Gadolinium gallium garnet; Lab moissanite; Synthetic opal; Metal-coated crystals hyped as rainbow quartz; Lab spinel; Synthetic turquoise; Terbium gallium garnet; Trinitite; Yttrium aluminium garnet; Yttrium iron garnet

  6. Amber - Wikipedia

    en.wikipedia.org/wiki/Amber

    An ant inside Baltic amber Unpolished amber stones. Amber is fossilized tree resin.Examples of it have been appreciated for its color and natural beauty since the Neolithic times, [1] and worked as a gemstone since antiquity. [2]

  7. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    Beryl (/ ˈ b ɛr əl / BERR-əl) is a mineral composed of beryllium aluminium silicate with the chemical formula Be 3 Al 2 Si 6 O 18. [6] Well-known varieties of beryl include emerald and aquamarine.

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