JDMISGem Reference
Silica · Opal

Water Opal (Colourless)

Water Opal (Colourless) — Opal

Water or crystal opal is transparent, body-colourless opal whose colour seems suspended inside the stone. Ethiopian Welo material dominates supply today.

Colour
colourless to white
Transparency
Transparent
RI
1.370–1.470
SG
1.98–2.23
Mohs
5.0–6.5
Birthstone
October
🔒 Full JDMIS reference record

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 in

Related gems

Achroite (Colourless Tourmaline) Transparent Labradorite Glass — Colourless (paste) Diamond (colourless-near colourless)

Browse the free gem reference · Test your eye — the Great Gem Quiz · Singapore gem testing labs

JDMIS Gem Identification Methods (GT200) Artisan Archetype Quiz Name That Gem Singapore Gem Labs How to Identify Jade