The Blue Gem (Battle Mountain) Mine is located near Battle Mountain in Lander County, Nevada. The mine was opened in 1934 as the Battle Mountain mine it was changed to the Blue Gem Mine. This mine has produced a wide range of Turquoise from dark greens to dark blues. The Blue Gem Mine is known to be a particularly deep deposit of turquoise, with some mine shafts descending 800 feet. The turquoise found in the Blue Gem mine is some of the highest quality turquoise found in Nevada. Due to the depths of the shafts and pressures of the earth, Blue Gem turquoise is an extremely hard and some say gem grade turquoise (given the name Blue Gem). The Son and I do all the cutting work we never farm it out. We are Native American gem cutters, we are registered members of the federally recognized Native American tribe Wichita Indians out of Oklahoma. The photos in this listing are taken in natural sunlight. To be clear if it says Natural it is natural it is backed with JB Weld, if it says 100% Natural it is all turquoise no backing was used. Size is Approximate give or take .5 mm Note: In the event of any typos in this listing, the item in the photos is the one or ones you will receive if you purchase this item. PLEASE NOTE: Some countries don't allow gemstones to be shipped to their citizens. Please check with Customs before making your purchases. If you live in one of the countries that don't allow gemstones to be imported and you buy from us, we will issue a refund and not ship the item. We offer a “NO HASSLE” seven-day refund with return shipping paid by the buyer. Our return policy starts when you receive the stone or it hits your PO Box, Buyer Pays return Shipping.