How Much Is Opal Worth?
Opal value spans an enormous range. Common 'potch' and milky opal sell for a few dollars, while precious opal with vivid play-of-color runs $10–$500+ per carat, and the finest Australian black opal can exceed $1,000–$10,000 per carat. The market is complicated by doublets and triplets (thin opal slices backed or capped to imitate solid opal) and by lab-grown synthetic opal. Value depends on body tone (black opal is most prized), the brightness and pattern of play-of-color, which colors appear (red is rarest and most valuable), solidity (solid beats doublet beats triplet), and origin (Australian, Ethiopian, Mexican). Cracked or 'crazed' stones are worth far less.
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Opal value by type
| Type | Typical price |
|---|---|
| Common / potch | $1 – $20 |
| Ethiopian / Mexican (per carat) | $10 – $100/ct |
| Australian crystal/white (per carat) | $20 – $300/ct |
| Fine black opal (per carat) | $200 – $10,000+/ct |
Educational ballparks for typical specimens — not a formal appraisal.
What drives opal value
- Body tone. Black opal is most valuable; white/light opal less so.
- Play-of-color. Bright, broad flashes — especially red — raise value sharply.
- Solid vs doublet/triplet. Solid opal is worth far more than layered doublets/triplets.
- Origin & integrity. Australian tops the market; cracked/crazed stones lose most value.
Is your opal real?
Beyond glass imitations, the big issues are doublets/triplets (thin opal layers glued to backing/caps) and synthetic opal. Viewed edge-on, a flat straight join line reveals a doublet/triplet; synthetic opal shows too-regular columnar 'snakeskin' color patterns.
Full opalreal-or-fake guide & at-home tests →FAQ
- What makes opal so valuable?
- Dark body tone (black opal), bright broad play-of-color, the presence of red, solidity, and Australian origin all drive value — top stones reach thousands per carat.
- What is a doublet or triplet opal?
- A thin slice of real opal glued to a dark backing (doublet) or also capped with clear quartz/glass (triplet) — cheaper than solid opal of the same face.