Australian Boulder Opal Cabochon 52ct – 39x17x5mm

A Statement Stone — 52 Carats of Australian Boulder Opal

This is a truly impressive specimen. At 52 carats and measuring a sweeping 39 x 17 x 5mm, this Australian Boulder Opal cabochon is a large, elongated stone with exceptional surface area to display its vivid play-of-colour. Whether destined for a collector's cabinet or a bespoke jewellery commission, this is a stone that commands attention.

Specifications

• Type: Boulder Opal cabochon — natural Australian opal in ironstone host rock
• Weight: 52 carats
• Dimensions: 39mm (length) x 17mm (width) x 5mm (depth)
• Cut: Cabochon — smooth, domed, and polished to maximise play-of-colour
• Origin: Queensland, Australia
• Backing: Natural ironstone matrix retained — adds structural integrity and a striking natural contrast to the opal's colour

Play-of-Colour

The elongated form of this cabochon creates a broad canvas for boulder opal's signature play-of-colour — spectral flashes of electric blue, green, gold, red, and violet that shift and dance as the stone moves in light. At this size, the colour display is truly spectacular.

About Boulder Opal

Found almost exclusively in Queensland, Australia, boulder opal forms in thin seams within ironstone boulders. The ironstone host rock is retained as part of the finished stone, providing durability and a beautiful natural backdrop. Australia produces over 95% of the world's precious opal, and boulder opal is among its rarest and most distinctive varieties.

Ideal For

At 52 carats and 39mm in length, this cabochon is ideal for a statement pendant, a large cocktail ring, a brooch, or as a centrepiece display stone for a serious collector. Its elongated shape lends itself beautifully to a horizontal pendant or bar setting.

Care Instructions

Opal contains water and can crack if exposed to extreme temperature changes or prolonged dryness. Store in a padded box away from direct sunlight. Clean gently with a soft, damp cloth. Avoid ultrasonic cleaners, steam, and harsh chemicals.