Quartz · Chalcedony

Blue Chalcedony

Natural blue chalcedony is a softly glowing, translucent blue with strong appeal in designer jewellery. Fine Namibian and American material is scarce; much commercial blue is dyed and should be disclosed.

Colour
blue

Transparency
Translucent

RI
1.530–1.539

SG
2.55–2.70

Mohs
6.5–7.0

Birthstone
March · August · May · July

🔒 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

Turquoise Blue Jadeite Chrysocolla / Gem Silica Milky Quartz

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