I've given 3 stars to the ring. The sliver of crystal opal was so thin that it would never withstand a tap against a hard surface. Shame because it was an absolutely gorgeous coloured stone - better to have a deeper slice for a higher price - and to have had a prettier setting because the shoulder diamonds didn't really do anything to set the opal off. It was returned I'm afraid.
Iridescence (opalescence) not as appeared on TV, and lustre varied too sharply in a plane across the gemstone.
Like the colour, but sadly this ring has not wowed me. Item will be returned.