Green Sapphire Identification: How to Tell Corundum by RI & Birefringence

Blue Sapphire Color Grading Comparison 💎 | Sapphire Guide

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💎 Sapphire: The Rainbow Gemstone of Corundum 🔵 1. What Exactly Is Sapphire? Sapphire is a precious variety of corundum, a crystalline form of aluminum oxide — Al₂O₃. But here’s the fascinating part: ❤️ Red corundum = Ruby 💎 All other gem-quality colors of corundum = Sapphire That means sapphire isn't only blue! 💛 Yellow 💚 Green 🩷 Pink 🟣 Purple & violet 🧡 Orange ⚪ Colorless 🔵 Blue And some sapphires can even show multiple colors or color zoning within the same crystal. 🧪 2. What Gives S

What does it actually mean when a sapphire has been heated? Heat treatment has been used in the gemstone world for generations to improve the colour and clarity of natural sapphires. A heated sapphire is still a natural sapphire — the treatment simply enhances characteristics already present within the stone. An unheated sapphire has not undergone this treatment, and fine examples can command a premium because of their rarity. But can you tell a heated sapphire from an unheated sapphire just by

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