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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. 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 ...

5. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   Jewellery (or jewelry in American English) consists of decorative items worn for personal adornment such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example.

6. Jewels of Diana, Princess of Wales - Wikipedia

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

   The central sapphire from the ring was set in the diamond sunray frame of the watch, replacing the watch face and became the centrepiece of a wide choker of midnight-blue velvet backed with Velcro. On either side of the sapphire is a chain of small diamonds, three deep, which runs halfway round the choker.

7. Bismarck Sapphire Necklace - Wikipedia

   en.wikipedia.org/wiki/Bismarck_Sapphire_Necklace

   The necklace consists of a single chain of platinum links connected by pairs of round brilliant cut diamonds. The 98.56-carat (19.712 g) table-cut Bismarck Sapphire is mounted in a pendant at the front of the necklace, surrounded by baguette-cut diamonds and eight smaller square-cut sapphires placed symmetrically around the edges of the setting ...