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ENGLISH
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5
PRELIMINARY GUIDELINE FOR GEMSTONE CLEANING
GEMSTONE TOUGHNESS STEAM
ALEXANDRITE EXCELLENT USUALLY
AMAZONITE POOR NEVER
AMBER POOR NEVER
AMETHYST GOOD RISKY
AQUAMARINE GOOD USUALLY
CITRINE GOOD RISKY
CORAL FAIR RISKY
DIAMOND GOOD USUALLY
EMERALD POOR NEVER
GARNET FAIR NEVER
IOLITE FAIR RISKY
LAPIS LAZULI FAIR NEVER
OPAL FAIR NEVER
PEARL GOOD NEVER
PERIDOT FAIR NEVER
RUBY EXCELLENT USUALLY
SAPPHIRE EXCELLENT USUALLY
SPINEL GOOD USUALLY
TANZANITE FAIR NEVER
TOPAZ POOR NEVER
TOURMALINE FAIR RISKY
TURQUOISE FAIR NEVER
VARISCITE FAIR NEVER
ZIRCON FAIR RISKY
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