White gold finish oval pink tourmaline created diamond earrings and necklace set This beautiful White gold finish oval pink tourmaline created diamond necklace and earrings will allow you to add an element of timeless sophistication to your jewellery collection. October | Tourmaline and Opal October also has two birthstones; Tourmaline and Opal. Tourmaline is a favourite gemstone for many because it’s available in a rainbow of beautiful colours. Opal gemstones are truly unique because each individual gem is adorned with a one-of-a-kind colour combination.