What is a opal (white) worth?
A fine 2 carat opal (white), heated and without certified origin, is worth roughly $390–$715 at retail — about $270 per carat.
Resale is far lower: $110–$190. Colored stones have no universal grading standard, so a buyer carries more risk and prices for it.
Opal (white) value by carat
Price per carat climbs with size far faster than it does for diamonds, because large clean opal (white) is much rarer than small. A 5 carat stone of this quality is priced at about 3.2× the per-carat rate of a 1 carat one.
| Weight | Per carat | Retail | Resale |
|---|---|---|---|
| 0.5 ct | $140 | $50 – $95 | $15 – $25 |
| 1 ct | $180 | $130 – $240 | $35 – $65 |
| 2 ct | $270 | $390 – $715 | $110 – $190 |
| 3 ct | $396 | $855 – $1,570 | $240 – $415 |
| 5 ct | $576 | $2,075 – $3,800 | $575 – $1,010 |
Opal (white) value by quality, 2 carat
Color is most of it: saturation, hue and how evenly it holds across the stone. Then clarity, then cut. The tiers below are the trade's working bands; two respected dealers can put the same stone in neighbouring tiers.
| Quality | Per carat | Retail, 2 ct |
|---|---|---|
| Commercial | $20 | $30 – $55 |
| Good | $81 | $115 – $215 |
| Fine | $270 | $390 – $715 |
| Exceptional | $810 | $1,165 – $2,140 |
Treatment matters more than size
This is the single most important thing about opal (white) value, and the thing owners least often know about their own stone. For a fine 2 carat opal (white), the same stone runs from about $38 (dyed) to $1,762 (untreated, lab certified) — a factor of roughly 47× — while looking much the same across a counter.
| Treatment | Multiplier | Retail, fine 2 ct |
|---|---|---|
| Not treated (lab certified) | 3.2× | $1,245 – $2,280 |
| Heated (standard) | 1× | $390 – $715 |
| Dyed | 0.07× | $25 – $50 |
| Unknown | 0.55× | $215 – $390 |
Heating is routine, permanent, accepted across the trade, and assumed unless a report says otherwise. Assume any stone is treated unless a report says otherwise.
Origin, but only if certified
For opal (white), the sources that command a premium are Australia, Ethiopia. A premium applies only when a recognized laboratory has certified the origin in writing. A seller's claim on its own is worth nothing.
| Origin | Multiplier | Retail, fine 2 ct |
|---|---|---|
| Australia | 1.2× | $520 – $950 |
| Ethiopia | 0.8× | $345 – $635 |
| Unknown / not certified | 0.9× | $390 – $715 |
Why the range is wide
Diamonds have the 4Cs and a dominant grading authority. Colored stones have neither. Color quality — which drives most of the value — is judged by eye, and two respected labs can describe the same stone differently. Any honest estimate for a opal (white) is a broader range than a diamond estimate, and ours is.
When a report pays for itself
If your stone might be worth more than about $2,000, a laboratory report on treatment and origin usually returns several times its cost. Without one a buyer must assume the least favorable case and price for that risk.
Value your own opal (white)
Enter the carat weight, quality, treatment and origin and get a figure matched to your stone rather than this example.
Open the gemstone calculator