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  2. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Luminous gemstones. Folktales about luminous gemstones are an almost worldwide motif in mythology and history among Asian, European, African, and American cultures. Some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds.

  3. Hierarchy of precious substances - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_precious...

    In popular culture, sets of precious substances may form hierarchies which express conventional perceived relative value or merit. Precious metals appear prominently in such hierarchies, but as they grow, gems and semi-precious materials may be introduced as part of the system. The sequences can provide interesting examples of the arbitrariness ...

  4. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    Present, dichroism or trichroism, depending on heat treatment. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate ), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a ...

  5. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Amethyst is a violet variety of quartz. The name comes from the Koine Greek αμέθυστος amethystos from α- a-, "not" and μεθύσκω ( Ancient Greek) methysko / μεθώ metho ( Modern Greek ), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. [1] Ancient Greeks wore amethyst and carved ...

  6. Larimar - Wikipedia

    en.wikipedia.org/wiki/Larimar

    Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona. Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many ...

  7. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and also can be colorless. A pinkish orange variety of sapphire is called padparadscha .

  8. Charoite - Wikipedia

    en.wikipedia.org/wiki/Charoite

    Charoite. 2O is a rare silicate mineral, first described in 1978. It is named after the Chara River, despite its being 70 km away from the discovery place; the name of the river translated from Evenki means “to melt, melt.”. [6] [3] When it was discovered, it was thought to be a fake, dyed purple to give it its striking appearance.

  9. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    Chrysoberyl. The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula Be Al 2 O 4. [5] [6] The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar". Despite the similarity of their names, chrysoberyl and beryl are two completely different ...

  10. Pleochroism - Wikipedia

    en.wikipedia.org/wiki/Pleochroism

    Purple and violet. Amethyst (very low): different shades of purple; Andalusite (strong): green-brown / dark red / purple; Beryl (medium): purple / colorless; Corundum (high): purple / orange; Hypersthene (strong): purple / orange; Spodumene (strong): purple / clear / pink; Tourmaline (strong): pale purple / purple; Putnisite: pale purple ...

  11. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light — giving the diamond its characteristic "fire" — make it useful for industrial applications and desirable as jewelry.