Australian Boulder Opal - 13.97 Cts - 26.6x13.3x5.5mm
When we started our online business about 10 years ago, one of the first varieties of colored gem stones I was exposed to was the boulder opal, and it captured me then and still does to this day. An excellent play of color no matter how it's viewed, it's one of those rare creatures, that not many people have been exposed to. Similar in some regards to a black opal, because of its dark backround, and multi color face. Boulder opal is found mostly in Queensland, Australia where precious opal forms in veins and patches within brown ironstone boulders, hence the name. Hardness ranges between 5.5 and 6 on the Mohs scale. Boulder opal is pretty durable due to the ironstone backing the opal forms on. it's water content is very low, so it almost never cracks as it ages. We came across this particular piece at the Las Vegas gem show, but it's the spark the fed the fire, as after we saw it we made plans to go to Australia in August to bring some more back for our clients.
All gemstones in our inventory and our jewelry are Natural mined
gemstones, NONE are lab created,lab Grown,man made, or synthetics
Black Opal-Black opals are dark
colored opal with internal reflections of green or red, and are usually mined
in Lightning Ridge, New South Wales.The term 'black opal' does not mean that
the stone is completely black (a common mistake), it simply means the stone
has a dark body tone in comparison to a white opal.
Solid Opal-Opal is left in its
natural state and simply shaped and polished
White Opal- White opals (or
sometimes called Light Opal) can range from transparent or translucent, to
opaque with a creamy hue, displaying soft pastel shades of color.
Opal Doublet-A thin layer of
opal that show enhanced color with a dark backing of either blac/greycolored
silica material, or sometimes a thin slice of common opal cemented to the
back of the opal with epoxy resin.
Boulder Opal-Boulder opal is
classified as solid opal. It occurs as thin veins of opal in the cracks and
cavities of light and dark brown ironstone boulders in Queensland.
Opal Triplet-A triplet opal is
similar to a doublet with a few minor differences. A triplet has a dark
backing like mentioned above for the doublet, it has a wafer thin slice of
opal in the middle (sometimes, no thicker than a sheet of paper), topped with
clear glass, quartz, or plastic capping in the shape of a dome
Crystal Opal-Crystal opal refers
to any kind of opal (examples. black opal,white opal,semi-black opal)boulder
opal) which has a transparent, translucent, or semi-translucent body.
Matrix Opal-Matrix opal is a
peculiar formation of boulder opal, whereby rich flashing colors of opal are
scattered throughout the brown ironstone like the christmas lights in the
Fire Opal-Fire opal are
transparent to translucent opals generally with rich body colors of yellow,
orange, orange-yellow or red. They do not usually show any play of color