noun
star sapphire
A sapphire that exhibits a star-like optical effect (asterism). Used as a gemstone.
彼女の指輪には大きなスターサファイアがはめ込まれていた。
Her ring was set with a large star sapphire.
Variant with interpunct; less common in running text.
サファイア is a general sapphire, while スターサファイア specifically refers to a sapphire with asterism.
Borrowed from English 'star sapphire'.