Chelsea Filter - now used to identify mostly any gemstone Dichroscope - invaluable for distinguishing certain stones from similar gems. 10x triplet jewellers loupe in black housing - one of the most important gemstone identification tools. Quality Gemological Refractometer with 10 grams of Certified R.I. 1.80 Liquid included. All Metal Construction. Identify almost all precious gemstones with this kit. Instructions on how to use 4 tools to identify gemstones. BONUS - GEMSTONES OF THE WORLD book by Walter Schumann. Essential Plus Gemological Tools Kit. This kit, if used properly, will allow you to identify almost all precious gemstones, using 4 essential gemological tools - Chelsea Filter, Dichroscope, Jewellers Loupe and Refractometer (10g of Certified 1.80 R.I. Liquid included), and to learn a lot about gemstones from hardcover Gemstones of the World book by Walter Schumann, highly rated by readers and experts.