Keywords Tag: |
bluechart, gem stone chart, gem chart, gem identification, gems, gemstones, gem list, gemlist, gemology, gemmology, gemmology research, gemmology education, gemmology training, gems, gemologist, gemmologist, precious stones, jewelry, jewellery, appraising, appraisal, evaluation, coloured stones, heated stones, gemstone imitations, color, colour, inclusions, inclusion, refractive index, birefringence, dispersion, fluorescence, phosphorescence, clarity, hardness, specific gravity, thermal conducti |