Tourmaline Ring, Dark Green Crystal Oval, 925 Sterling Silver, s3A Dark Green Raw Tourmaline Crystal with the natural striations along the Crystal Length showing very clearly with nice sharply defined edges. Carved into an Oval shape and set as a ring in 925 Sterling Silver with an open bezel setting and adjustable ban Tourmaline is famously the most energising of all crystals and gemstones. It increases the flow of energy along all your energy lines which both unblocks them and gives stamina to achieve long term