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Gem Calcite Dichroscope
Easily distinguish garnet from ruby by determining if a stone is dichroic (reflects two colors).
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Gem Computer Gauge
The Presidium Gem Computer Gauge estimates the weight and identifies gemstones with much greater precision and consistency.
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Gem Gauge Electronic -Presidium
SPECIAL ORDER - Please allow two weeks for delivery. Electronic version of the traditional gem gauge.
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Gem Gauge Precision
Large easy to read dial.
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