Unset Boulder Opal

black boulder opal rectangle unset stone
Boulder opal rectangle 1199

Unset Boulder Opal

Size: 37×21 mm mm (approx 1 1/2″ long) Total Carats: 64.55 Shape: Rectangle Origin: Winton or Quilpie Australia Shipping: Free to your door or post office box by registered mail. Packaging: Black velvet pouch or gem box


This quality boulder opal comes from the Western Queensland fields. Stones like this are becoming rarer as the opal fields are running out. The price of the stone, unlike many gemstones is influenced by supply and demand, not by international cartels who agree on price increases. Hence, it is destined to go up in value as the supply becomes more restricted which is happening at present. The color of these Black boulder opal stones is completely natural, in contrast to diamonds [for example] which depends on man-made facets to reflect the spectrum colors.

Many of them are presented with some of their ‘mother’ ironstone showing in the foreground. This often adds to the interest of the opal piece because the patterns and shapes that present themselves often stimulate the imagination, much like the clouds in a clear blue sky. Some of these lovely pieces conjure the imagination and can be called ‘picture’ or ‘personality’ opals. In this case, the ironstone shows brilliant flecks of gem color, against the ironstone and are like stars in the sky. The ironstone ‘mother’ holds the ‘baby’ which is the opal. Hence the term: ‘matrix’ (mother).

other details

Boulder is from Queensland and is also a variety of black if it is found with a dark or black background similar to Lightning Ridge Black opal

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