Common Opal

Q: What is Common Opal?

Common opal lacks the play-of-color that characterizes precious opal, instead presenting a homogeneous, waxy appearance in a wide range of colors including white, yellow, green, pink, and blue, colored by various trace element impurities or organic matter. Found worldwide in sedimentary and volcanic

Q: What is the hardness of Common Opal?

Common Opal has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.

Q: What color is Common Opal?

Common Opal is primarily White.

Q: How much does Common Opal cost?

Common Opal falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.

Q: What is the crystal system of Common Opal?

Common Opal belongs to the Amorphous crystal system.

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 5.5 – 6.5

Specific Gravity 1.98 – 2.5

Refractive Index 1.37 – 1.52

Crystal System Amorphous

Luster Wood Opal

Cleavage None

Fracture Conchoidal,Splintery

Color white

Pleochroism Absent

Mohs Hardness

Mohs Hardness: 5.5 – 6.5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Common Opal

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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About Common Opal

Common opal lacks the play-of-color that characterizes precious opal, instead presenting a homogeneous, waxy appearance in a wide range of colors including white, yellow, green, pink, and blue, colored by various trace element impurities or organic matter. Found worldwide in sedimentary and volcanic deposits, it is used as a lapidary material for cabochons, beads, and carvings. Varieties such as Andean pink opal (from Peru) and green opal are valued for their soft, pastel beauty.