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Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply
Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply - image 2
Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply - image 3
Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply
Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply - image 2
Natural Boulder Opal Cabochon Lot, Designer Jewelry Making Supply - image 3

Australian Boulder Opal Cabochons, October Birthstone Healing Stone for Rings, Pendants and Bezel Settings

  • $16.99
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Stone Name Natural Boulder Opal Cabochon
Origin Australia
Shape Mixed Natural Cabochon Shapes
Size Approx 18 to 25 mm
Color Natural Matrix Patterns with Blue, Green and Fire Flashes
Quality Grade AAA
Treatment 100% Natural, Untreated
Back Side Flat Back Cabochon
Finish High Polish
Hardness (Mohs) 5.5 to 6.5
Birthstone Month October
Pack Options 1 Piece, 3 Pcs, 5 Pcs, 10 Pcs
Best Used For Rings, Pendants, Earrings, Bezel Settings, Designer Jewelry

 

Hold one of these up to the light and you'll see why boulder opal has its own loyal following. Unlike a solid opal that's all color, this stone keeps its natural ironstone host attached, so you get streaks and patches of blue, green, and sometimes fiery orange breaking through a dark, earthy background. It reads more like a tiny landscape than a gemstone, which is exactly why designers reach for it when they want a piece that doesn't look like everything else in the case.

Every cabochon in this lot comes out a little different. Some pieces lean heavier on the matrix with just a thread of color running through, others show broader flashes that catch the light the moment you turn them. That unpredictability is part of the appeal for anyone who's tired of uniform, machine perfect stones. The flat polished back sits flush in a bezel, so setting one into a ring or pendant is straightforward for anyone comfortable with basic stone setting.

If you've been collecting opal for a while, you already know boulder opal tends to be tougher and more wearable day to day than solid opal, since the ironstone backing adds real structure. For first time buyers, this is an easy way to get genuine Australian material without committing to a single expensive showpiece.

Australian Boulder Opal Cabochons, October Birthstone Healing Stone for Rings, Pendants and Bezel Settings - 1 Piece

$16.99

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Product Frequently Asked Questions

Why does boulder opal look so different from other opals I've seen? +

Because it's not cut all the way through the opal seam. The lapidary leaves a layer of the original ironstone rock attached to the back, so what you're seeing is a thin ribbon of opal color sitting on top of natural stone. That's what gives it that landscape like matrix pattern instead of a solid sheet of color.

Will every piece in the lot show strong blue or green flashes? +

Not evenly. Some cabochons are heavy on fire, others show a quieter, more subtle line of color through mostly dark matrix. That range is normal for boulder opal and part of why sellers photograph a full batch rather than a single perfect stone, so you're seeing a realistic mix, not a cherry picked sample.

Is this real opal or is it a doublet or triplet? +

This is a natural, solid boulder opal cabochon, meaning the color layer is part of the original stone with its natural ironstone backing, not a manufactured sandwich of opal, glue, and quartz like a doublet or triplet. If you're comparing listings elsewhere, that's the main thing worth double checking.

How tough is boulder opal compared to a regular solid opal? +

The ironstone backing actually works in your favor here. It gives the stone more structural support than a thin sheet of solid opal, so boulder opal generally handles everyday knocks a bit better. It's still an opal though, so it's not immune to chips if it takes a hard hit.

Can I set these into a ring myself, or do I need a jeweler? +

The flat polished back is made for bezel setting, so if you already do basic stone setting work, these will behave like any other cabochon. If you're new to setting stones, a local jeweler can bezel one of these in without much trouble since the shape is straightforward and there's no faceting to worry about.

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