Gem Reference
Gem Reference
Madagascan blue apatite is the neon-blue bargain of the gem world: RI 1.63, strong blue/yellow dichroism and hardness 5. It demands protective settings but delivers remarkable colour per dollar.
Sign in to unlock price ranges by tier, common misidentifications, diagnostic inclusions, treatments, spectra, trade names and sources — free with the GT200 Gem Identification course.
GT200 Gem Identification ↗ Sign inBrowse the free gem reference · Test your eye — the Great Gem Quiz · Singapore gem testing labs
