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2. Asterism (gemology) - Wikipedia

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

   Asterism on the surface of a blue star sapphire. 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.

3. Sapphire - Wikipedia

   en.wikipedia.org/wiki/Sapphire

   Star sapphire 68 carat star sapphire in round mogul cut - men's ring version - 750 yellow gold - Russian goldsmith - handmade around 1990. A star sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism; red stones are known as "star rubies".

4. 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]

5. Star of India (gem) - Wikipedia

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

   Star of India. The Star of India is a 563.35-carat (112.67 g) star sapphire, one of the largest such gems in the world. [1] [a] It is almost flawless and is unusual in that it has stars on both sides of the stone. The greyish-blue gem was mined in Sri Lanka [3] and is housed in the American Museum of Natural History in New York City.

6. Yogo sapphire - Wikipedia

   en.wikipedia.org/wiki/Yogo_sapphire

   A 0.37-carat (0.074 g) brilliant cut purple Yogo sapphire. Only about two percent of Yogo sapphires are purple. The Yogo dike is a narrow subvertical sheet-like igneous body. It varies from 2 to 26 feet (0.61 to 7.92 m) thick and extends for 5 miles (8.0 km), striking at an azimuth of 255°.

7. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Even the same named gemstone can occur in many different colors: sapphires show different shades of blue and pink and "fancy sapphires" exhibit a whole range of other colors from yellow to orange-pink, the latter called "padparadscha sapphire". [39] This difference in color is based on the atomic structure of the stone.