A Paraiba-type tourmaline and diamond three-stone ring, the oval-shaped tourmaline is set with a triangular-shaped diamond to each shoulder in platinum, London hallmarks, size R Apanied by report number 290043/20055689 dated 13th December 2021 from AnchorCert stating that the oval-shaped tourmaline weighs approximately 8.53cts and is a copper-bearing Paraiba-type tourmaline.ment: colour of these tourmalines can be due to non-detectable heat treatment.