Gordon Herford 18ct. gold, tanzanite and diamond dress ring central stone is 5.12ct., with 14 princess cut diamonds. Gordon Herford is one of the few master Jewellers invited to tender for the world's most precious diamonds: Australia's unique Argyle pink diamonds. Winner of DeBeers Supreme diamond design award, Harpers Bazaar and diamond Guild Australia Argyle pink diamond Award, de beer's diamond Anniversary ring Award, and the Supreme diamond design Award