Ideally, the star in a star sapphire should be perfectly
centered when viewed from directly above, with each ray of equal
length. The rays should be bright, sharp, and clearly
defined–not blurry or fuzzy–and they should reach from the crown
of the cabochon to the base without interruption. Star sapphires
occur in almost every color seen in transparent sapphires,
although yellow, orange, and green star sapphires are very
uncommon..
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