Calculates gemstone carat weight, gram weight and tolerance value ranges.
Contains 300+ gemstones and over 60 facet/cut types.
Browsable A-Z list of crystals, gemstones and minerals, each with its own image and complete geological profile.
Glossary of mineralogical terms and definitions.
Directly compare gemstone profiles.
Unit conversion tool.
Full history of calculations for fast consults.
Free database updates.
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