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Thermal conductivity tester work on all gemstones.CorrectIncorrect
Tanzanite is a variety of zoisite.CorrectIncorrect
Variety of gemstones are named by their colour.CorrectIncorrect
Natural and synthetic gemstones have the same chemical, optical and physical properties.CorrectIncorrect
Opals can absorb a lot of water.CorrectIncorrect