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Gem quality Ruby sometimes exhibits a star effect known
as ‘Asterism’, this effect is enhanced when a gemstone
is cut and polished ‘En Cabochon’: a dome cut with a
flat bottom. The ‘Asterism’ effect is caused by two
or more sets of tiny parallel inclusions, known as ‘Rutile’
or ‘Silk’, running the internal length of the gem. These inclusions
intersect at differing angles with each other, causing
the reflected light to form a star like formation across
the gem's face. |