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  2. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Swiss Blue, subtly lighter than the US variety, is the result of a combination of the two methods. [26] Diamonds are mainly irradiated to become blue-green or green, although other colors are possible. [29] When light-to-medium-yellow diamonds are treated with gamma rays they may become green; with a high-energy electron beam, blue. [23]

  3. Lapidary (text) - Wikipedia

    en.wikipedia.org/wiki/Lapidary_(text)

    Medieval or early modern lapidaries describe particular gemstones' protective and healing properties, including diamond, emerald, sapphire, amethyst, ruby, etc.Some of the stones mentioned are metals or metallic compounds such as cinnabar, hematite, calamine, and magnetite.

  4. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .

  5. Diamond enhancement - Wikipedia

    en.wikipedia.org/wiki/Diamond_enhancement

    The color produced is a blue to blue-green which penetrates the whole stone. Such diamonds are not annealed. The blue color can sometimes approach that of natural Type IIb diamonds, but the two are distinguished by the latter's semiconductive properties. As with most irradiated diamonds, most gamma ray-treated diamonds were originally tinted ...

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A diamond cutter in Amsterdam. A few gemstones are used as gems in the crystal or other forms in which they are found. Most, however, are cut and polished for usage as jewelry. The two main classifications are as follows: Stones cut as smooth, dome-shaped stones called cabochons or simply cab. These have been a popular shape since ancient time ...

  7. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    The Old English Lapidary, for instance, detailed the healing properties of stones, reflecting the belief that gemstones could cure illnesses and provide spiritual protection. Kitson argues that lapidaries in this period served a dual purpose: they were not only scientific texts that described natural phenomena but also moral and religious ...

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