What mine is this turquoise from?
If I had a nickel for every time I have been asked that question or have seen someone ask it on a group or forum, well, if I saved up all those nickels, I might be able to buy one of these gorgeous pieces !!
But seriously, people want to know. And the answer is……… Sometimes it is fairly straightforward and sometimes the difference between stones from various mines is a bit more fuzzy.
I have seen trays of stones from one particular mine, for example Bisbee below, that range widely in color, matrix, density and hardness – from blue to green and everything in between, with honey to black matrix and from somewhat crumbly to super hard.
With that said, there are certain mines that tend to produce stones that have a certain LOOK to them and can be identified with a fair degree of certainty.
Here is a vintage bracelet – gorgeous stones. Note how one has turned a little green over the years – this is one sign of a natural turquoise stone as it ages………or it could have been a little greener stone to start with. Some say this is Bisbee, other suggest Blue Diamond while even Persian has been suggested. I’m just going to say beautiful turquoise.
Bisbee turquoise was a by-product of copper mining near Bisbee, Arizona. It is known mainly for its brilliant blue color and smoky webbing. Bisbee turquoise was found at all levels of the copper mine from 100 to 2000 feet and the quality and coloration varies widely from layer to layer. Often the stones have a matrix of brown, gray or black, but clear stones of blues and greens have also come from the Bisbee mine. There was never that much turquoise mined in Bisbee to begin with and now the mine is closed. What remains today is in the hands of old miners and long-time collectors. Because of its hardness, quality and scarcity Bisbee turquoise is one of the most valued turquoise in the world today.
Blue Diamond (central Nevada) operated from the late 1950’s to 1980. This stone typically has dark smoky swirls with brilliant blue windows.
Here are some other articles on our website and on this blog with turquoise mine information.