Star Ruby
Star sapphire is a respected member of the corundum family.
Red corundum is called ruby. All other color varieties of corundum
are referred to as sapphire. Corundum is the second hardest
substance on the Mohs scale, with a rating of nine. Diamond tops
that scale with a ten.
That hardness combined with the rich color
and silky shine make fine sapphires extremely valuable. Star
sapphires contain unusual tiny needle-like inclusions.
Those rutile
needles result in a silky shine on the surface of the gem. Aligned
needles that intersect each other at varying angles produce a
phenomenon called asterism (from the Latin aster for star). Because
of their crystal structure, only the star sapphire and the star ruby
show six white rays of light that meet in one point and dance over
the gem's surface when viewed from different directions.
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