Up for auction is a 7 x 5 mm cut natural olive-green tourmaline ((Ca,K,Na)(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4) gemstone fashioned into a smoothed domed cabochon. This is a particularly dark coloured specimen so unless it is held up to a light source (such as sunlight - see photograph) the olive-green coloration is not apparent. However it may be of use in low-cost jewellery as high-grade tourmaline of this size would obviously cost much much more! Otherwise the gemstone is in good condition - no major cracks/chips.

As seen on the photo, there are some cracks, fissures and inclusions noticeable on the inside of the stone as common with natural tourmaline crystals. Tourmaline is a very complex borosilicate gemstone and has the title for the gem species with the most wide-ranging colour scheme.

Note that payment is to be made no more than 3 days after the end of auction unless communication is made by the winning bidder; otherwise I reserve the right to relist the auction.

Check out some of my other auctions - I am selling a few bits and pieces. Thanks for viewing and happy bidding :)!