Ключевые слова: accuracy, analysis, assurance, careful, color, colors, control, craftsmanship, crystals, detailed, details, equipment, evaluation, examination, expert, gem, gemology, gems, gemstones, handling, hands, industry, inspection, intricate, laboratory, light, materials, mineral, pink, precious, precision, professional, quality, reflection, research, science, scientific, skilled, specialist, standards, stones, study, synthetic, techniques, technology, valuable, vibrant, visual,