Large Round Boulder Opal Cabochon
Updated October 27, 2026
| Lot number | 3 |
| Auction | 11-15-2026 Gold, Diamonds, 14k Rolex, Gemstones, Cameos! |
| Date | November 15, 2026 at 7:01 PM EST |
| Auction house | Tom Hall Auctions, Inc |
| Location | Schnecksville, Pennsylvania |
This specimen appears to be a natural Australian boulder opal featuring a vibrant play-of-color across a dark ironstone matrix. The round cabochon displays electric blue, violet, and turquoise flashes with secondary orange highlights. The stone measures 19.7 x 19.35 x 8.1 mm and weighs 28.60 carats. The gemstone is in good condition with a high-gloss finish, though it exhibits natural surface-reaching inclusions and pitting characteristic of the ironstone matrix. The piece is ready for a setting.
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