The stone originates from Labrador. I'm not an expert but based on it's appearance it's either classified as Natural AAA or Natural AA. The silver has a 925 stamped on it, which means it's 92.5% pure & is commonly known as sterling silver. The back is stamped by the designer's symbol, which I believe is Sparkes Design in Newfoundland. I bought it from a pop-up kiosk long ago. As you can see from the photos, the stone has a smooth polish, is luminescent, & the shades of blue & green vary, & the dark veins add to its beauty. The dimensions are 1 ¾ inch long & ½ wide. All you need to do is find the perfect chain for you, & polish the silver now & then. Cash. Local Sale. I don't text so messages may be delayed. Please schedule an appointment. I'll send the address once confirmed. I also don't hand out my phone number.