Rocks Gemstone Collection 18ct White Gold Ring With An Oval Green Tourmaline Stone In A Halo Of Round Brilliant Cut Diamonds. This stunning ring is will make a perfect addition to any ladies jewellery collection. Handmade by 'Michael Rock' it is truely a unique piece. Tourmaline is the birthstone of October but can be worn & cherished by anyone lucky enough to be gifted it, no matter the occasion. Diamond Weight: 0.46ct Green Tourmaline Weightt: 4.21ct