Rutilated quartz
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Rutilated quartz is a variety of quartz which contains acicular inclusions of rutile. It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or blac
Rutilated quartz used as a gemstone
Asterism (gemology)
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An asterism is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon.
Rutilated quartz
…golden, but they also can appear silver, copper red or black. The inclusions may be distributed randomly or in bundles, which sometimes are arranged star-like, and they can be sparse or dense enough to make the quartz body nearly opaque. While otherwise inclusions often reduce the value of a crystal, rutilated…
Asterism on the surface of a blue star sapphire.