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  2. Black Star sapphire - Wikipedia

    en.wikipedia.org/wiki/Black_Star_sapphire

    Black star sapphire, also known as 'natural star sapphire' is a type of corundum (aluminum oxide). It is usually cut into a dome shape to show a star feature. If it is cut with a flat or almost flat face, then a golden colour is revealed. The chemical composition and features for black star were analyzed in the Journal of Gemmology. [citation ...

  3. Asterism (gemology) - Wikipedia

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

    The star-effect may be also caused by the inclusions of hematite. In black star sapphire hematite needles formed parallel to the faces of the second order prism produce asterism. Some star sapphires from Thailand contain both hematite and rutile needles forming a 12-ray star. [3] Star-stones were formerly regarded with much superstition. [1]

  4. Jewels of Diana, Princess of Wales - Wikipedia

    en.wikipedia.org/wiki/Jewels_of_Diana,_Princess...

    The Duchess of Cambridge (right) wearing the double drop sapphire earrings at the 2022 Trooping the Colour. Four of the sapphire and diamond clusters from the watch strap were used to create a pair of earrings, with two clusters as detachable pendant drops. [34] Diana wore these sapphire earrings both in the form of double drop earrings and studs.

  5. Earring - Wikipedia

    en.wikipedia.org/wiki/Earring

    Jasper drop earrings. A drop earring attaches to the earlobe and features a gemstone or ornament that dangles down from a chain, hoop, or similar object. The length of these ornaments vary from the very short to the extravagantly long. Such earrings are occasionally known as droplet earrings, dangle earrings, or pendant earrings.

  6. Black Star of Queensland - Wikipedia

    en.wikipedia.org/wiki/Black_Star_of_Queensland

    The Black Star of Queensland, also known as the Brimstone of Queensland, named after its nature and place of origin, is a 733-carat (146.6 g) black sapphire, and was the world's largest gem quality star sapphire until The Star of Adam was discovered. The Black Star sapphire is an oval-shaped gemstone cut as a cabochon like all other star ...

  7. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.

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