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  2. List of sapphires by size - Wikipedia

    en.wikipedia.org/wiki/List_of_sapphires_by_size

    Sapphire Origin Date Size Cut Color Location Ref Star of Adam: Sri Lanka 2015 1,404.49 carats (280.898 g) Star Blue Anonymous owner [3] Black Star of Queensland: Australia 1938 733 carats (146.6 g) Star Black Anonymous owner [4] Star of India: Sri Lanka 563.4 carats (112.68 g) Star Blue-gray American Museum of Natural History, New York [5]

  3. Ring enhancer - Wikipedia

    en.wikipedia.org/wiki/Ring_enhancer

    A Ring Wrap is a single band, contoured to fit around a solitaire diamond ring, displaying additional diamonds on both sides of the center stone. This type of enhancer literally wraps around the solitaire diamond, without completely encircling the center stone. An insert ring is usually a split, double band which provides a gap between the two ...

  4. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    An uncut, rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana. 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, it occurs in other colors, including gray and black, and also can be colorless.

  5. Asterism (gemology) - Wikipedia

    en.wikipedia.org/wiki/Asterism_(gemology)

    A purple-pink star sapphire displaying asterism in a platinum ring. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted).

  6. Golden sheen sapphire - Wikipedia

    en.wikipedia.org/wiki/Golden_sheen_sapphire

    Several articles, including the Journal of Gemmology state that gold sheen sapphire is high in iron and titanium oxide. [2] It has inclusions of ilmenite, hematite (gold color) [5] and magnetite (black). It exhibits asterism and hexagonal growth, [6] a lack of UV fluorescence, healed fractures and polysynthetic twinning (parallel lines). Golden ...

  7. Yogo sapphire - Wikipedia

    en.wikipedia.org/wiki/Yogo_sapphire

    An uncut/rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana "Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [18] More gem-quality sapphires are produced in Montana than anywhere else in North America. [18]

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