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https://sedagems.com/blog/technical/gemstone-asterism/
Aug 20, 2019 · Asterism is actually a visual trick that occurs because the tiny fibers within the gem have a higher refractive index than the gemstone itself. This causes a bright star-like pattern to reflect off of the fibers and formulate little outward rays.Estimated Reading Time: 6 mins
https://www.jewelinfo4u.com/asterism-in-gems
Mar 09, 2016 · Asterism” is a term, which is most commonly used in gemology. It refers a kind of special optic phenomenon that has been seen in several gems. Special optic phenomena refer uncommon and excellent optic properties exhibit by some rare gemstone. The phenomena are particular property of transmitting or reflecting light.Estimated Reading Time: 5 mins
https://www.antiquejewelleryonline.com/pages/asterism-explaining-the-star-sapphire-and-star-ruby
Asterism. Star stones develop their impressive pattern due to a phenomenon called asterism, a word derived from the ancient Greek word for star. When the stone is formed it includes uniform impurities of titanium dioxide contained within the mineral rutile. These tiny filaments, colloquially known as “silk”, are laced throughout the entire ...
https://www.jewellermagazine.com/Article/8695/A-guide-to-asterism-and-chatoyancy
Sapphire and ruby, diopside, garnet and rose quartz can display asterism. When asterism is present, the gem is named by using ‘star’ as a prefix, followed by the gem name, for example, star sapphire or star ruby. Asterism occurs when light is reflected off inclusions of fine crystals or fibres that are orientated at specific angles to each other.Estimated Reading Time: 4 mins
https://en.mimi.hu/jewelry/asterism.html
Asterism is an optical phenomenon that results in the reflection of light rays on a gemstone, cut en cabochon, forming a star. Dense, fine parallel inclusions cause light to reflect as a …
https://www.jewellerynet.com/en/jnanews/features/9272
May 31, 2017 · ASTERISM is the ultimate reference book for aficionados of star gems and experts alike. The illustrations are spectacular; the histories and stories are fascinating; and the scientific explanations are rigorous, yet clearly understandable. One thing is sure – in this enormous and incredible undertaking, the stars are always shining.
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