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
Boulder Opal Cabochon – Blue Centre with Green & Purple Pinfire
Boulder Opal Cabochon – Blue Centre with Green & Purple Pinfire
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Blueoasis - A boulder opal that looks like a tiny blue oasis set in warm desert stone, its green‑purple pinfire sparkling like life gathering around a hidden pool.
This polished boulder opal cabochon features a striking blue centre that draws the eye immediately, surrounded by soft green and purple pinfire that sparkles across the surface.
The natural ironstone matrix frames the colour beautifully, giving the stone an earthy depth and grounding that’s characteristic of true Australian boulder opal.
With brightness 3, the colours lift gently in the light without overpowering the stone’s organic charm. Its teardrop shape and double‑sided finish make it a versatile choice for jewellery makers - perfect for a pendant, wire‑wrapped design, or a collector’s display piece.
Sourced directly from the miner, this cabochon carries the authentic character of Queensland opal fields.
- Opal Type: Boulder Opal
- Format: Cabochon (solid)
- Colour: Blue, Green, Purple
- Pattern: Pinfire
- Shape: Teardrop
- Finish: Polished
- Brightness: B3 (of 5)
- Stone Dimensions: 24 × 18 × 4 mm
- Weight: 4 g
- Back: Natural ironstone matrix
- 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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Ethical Opal Sourcing
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A simple guide -
Opal Brightness Guide
Judging brightness