Ключевые слова: bright, brilliant, carat, citrine, clarity, clear, commodity, crystal, crystalline, cut, diamond, engagement, facet, fashion, gem, gemology, gemstone, geologist, geology, glass, hard, industry, jewel, jewelery, jewelry, manufacturing, mine, mineral, namibia, ore, power, precious, purity, refractive, rough, sample, science, shine, sparkle, stone, tourmaline, transparent, treasure, uncut, valuable, white, yellow beans,