18ct Yellow Gold 0.31ct Oval Opal and Diamond Cluster RingMade in 18ct yellow gold, this cluster ring features a four claw set 6mm x 4mm oval opal weighing 0. 31ct, with a beautiful pink and green play of colour. Surrounding the opal are sixteen round brilliant cut diamonds, totalling 0. 09ct. As opal is the birthstone of those born in October, we think this makes a wonderful present and gift to those who are looking for a piece of jewellery to represent their birth month. As seen paired with our 18ct yellow