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2. 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]

3. 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 ...

4. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as "star rubies". Star sapphires contain intersecting needle-like inclusions following the underlying crystal structure that causes the appearance of a six-rayed "star"-shaped pattern when viewed with a single overhead light source.

5. Star of India (gem) - Wikipedia

   en.wikipedia.org/wiki/Star_of_India_(gem)

   Mineralogist and Tiffany gem expert George Kunz (1856–1932) was commissioned by wealthy financier J. P. Morgan (1837–1913) to acquire an impressive gem collection for an exhibit at the Paris Exposition of 1900; the Star of India was among the stones Kunz procured. [4] The Star of India is a huge blue star sapphire weighing 563.35 carats.

6. Black Star of Queensland - Wikipedia

   en.wikipedia.org/wiki/Black_Star_of_Queensland

   The Black Star sapphire is an oval-shaped gemstone cut as a cabochon like all other star sapphires. The center of the star is much bigger and brighter than normal star sapphires. The bright six-ray star is set in a completely black background. The beauty of the stone is further enhanced by its white gold setting. The large black stone is ...

7. 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.