Chelsea Filter, Dichroscope, Jewelers Loupe - Gem Identification Tools Bundle - 4 items Identify about 85% of all precious gemstones with this kit. Instructions on how to use 3 simple tools to identify gemstones. Chelsea Filter - now used to identify mostly any gemstone Dichroscope - invaluable for distinguishing certain stones from similar gems. 10x triplet jewelers loupe in black housing - one of the most important gemstone identification tools. BONUS - GEMSTONES OF THE WORLD book by Walter Schumann