Opal Brightness Explained
Opal brightness is graded on the B1–B5 scale, where B1 is very dim and B5 is vivid and intense.
Georgie's Gem Studio
Oval Boulder Opal Cabochon – Blue & Green Pinfire
Oval Boulder Opal Cabochon – Blue & Green Pinfire
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Desertrain - A boulder opal with soft blue‑green pinfire that falls across its warm matrix like rain drifting over a sun‑baked desert, the tiny seams giving it the look of cracked earth catching scattered drops. Quiet, earthy and beautifully atmospheric.
This polished tribal oval boulder opal cabochon shows soft blue‑green pinfire dancing across its surface, with small natural seams that give the stone depth and character.
Its double‑sided nature reveals subtle colour and matrix on the reverse, making it a versatile piece for jewellery makers who love stones with personality.
With its generous size and gentle brightness, it’s ideal for a statement pendant, wire‑wrapped design, or a collector’s display piece.
- Opal Type: Boulder Opal
- Format: Cabochon
- Colour: Blue/Green
- Pattern: Pinfire
- Shape: Oval
- Finish: Polished
- Brightness: B2 (of 5)
- Stone Dimensions: 28 × 21 × 5 mm
- Weight: 10 g
- Back: Double‑sided with visible seams
- Fitting: None (loose stone)
- Source: Miner‑direct
- Origin: Boulder Opal Fields Australia
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About Our Opals
We only work with Australian opals, direct from #MinerToMaker.
Every stone is natural, untreated, and individually cut.
No two opals are ever the same - each piece is one‑of‑a‑kind.
We source directly from small Australian miners and cutters.
Every opal comes from Queensland’s ethical, regulated opal fields.
All photos are taken with a macro lens, remember to check the opal dimensions before purchasing.
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Opal Brightness Guide
Judging brightness