description Star Garnet Overview
Star garnet is a variety of garnet that displays asterism, a star-like reflection caused by oriented inclusions within the stone. The effect is usually seen as four or six rays when the material is cut as a cabochon and viewed under a direct light source. Idaho recognizes star garnet as its official state gemstone, and the material is used mainly for cabochons, specimens, and distinctive jewelry.
help Star Garnet FAQ
What causes the star effect in star garnet?
Star garnet shows asterism, a star-like reflection caused by oriented inclusions inside the stone. The effect becomes visible when light interacts with those aligned inclusions.
How many rays can a star garnet show?
A star garnet commonly shows four or six rays. The star is usually easiest to see when the stone is cut as a cabochon and viewed under direct light.
How should star garnet be cut to show its star?
It is generally cut as a cabochon, with a smooth curved top rather than many flat facets. Direct light then reveals the reflected star pattern.
Why is Idaho associated with star garnet?
Idaho recognizes star garnet as an important state gemstone. The state's association comes from deposits that produce garnet with visible asterism.
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