Curated Collection
Exquisite
Unheated Ceylon Sapphires
Unheated Ceylon sapphires are 100% natural gemstones that have never undergone thermal enhancement. Representing less than 1% of gem-quality corundum mined, they command significant investment and collector premiums.
Mineral
Natural Corundum (No Heat)
Mohs Hardness
9.0
Refractive Index
1.762 – 1.770
Primary Origin
Sri Lanka
Buying Guide & FAQs
Unheated sapphires trade at a 50% to 300%+ price premium over identical heated stones. In top quality stones above 3 carats, unheated specimens appreciate as collectible investment assets.
Gemologists inspect intact rutile silk, unaltered discoid fractures around zircon crystals, and FTIR spectroscopy curves that confirm the crystal lattice has never been exposed to high-temperature furnace heating.
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