Linde star sapphire

Linde Star Sapphire: A synthetic star sapphire developed in 1967. Many star sapphires found today are these synthetics.
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LINDE STAR SAPPHIRE
Linde star sapphire ("Linde stars") are synthetic star sapphires that were first made by the Linde Air Products Company in 1947 (they also developed star rubies that year).

Natural sapphires are sometimes found that exhibit a star effect. These can be quite valuable if the star is centered and well-defined, but in 1967 the synthetic Linde Star Sapphire hit the market, ...

See also: Polish, Opaque, Jewel, Pearls, Precious stone