It is set with natural Opals, rich royal blue enamel workmanship and a central, sparkling Diamond.The rich, colourful Opals radiate a myriad of hues - blues, green, pinks, turquoise as well as an inner orange radiate from within their spheres.All of nature's splendour seems to be reflected in the manifold opulence of the Opal - fire and lightnings, all the colours of the rainbow and the soft shine of far seas.This head has been added to the Pin at one stage and may have originally been part of an earring / necklace.The actual Pin head is 18ct yellow gold.It weigh 2.5 grams.In very good condition it looks gorgeous when worn.The Pin is 2.25 inches.The Pin head is 10mm across and down - that's just less than 1/2 an inch.