Mint Tourmaline 3.78cts RoundA unique and unusual mint green coloured natural Tourmaline gemstone. The gem is a fancy round cut, weighing 3. 78 carats with a measurement of 9. 8mm diameter x 6. 9mm deep. Tourmaline represents October's birthstone and is available as a limited edition one of a kind gemstone to purchase loose or to be set into an item of jewellery. Please contact us for more help with our bespoke jewellery designs service.