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.

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