Sterling Silver ring size 6

made and bought in a small village within the Mayan Riviera Mexico. the gem isn't valuable but it's native to the Mayans and changes colour in different lighting, truly. I find for the most part in the winter here in Canada's the gem remains the turquoise aqua colour you see here in the photos. but in the summer there's often times I look down and it's a dark purple/blue. it's something to do with light sources I don't remember :') but it's very cool, it's well-made, the small crystals are quality but also not of high value. solid sterling silver, size 6.