2.10ct Coober Pedy Opal, with green, blue, pink and red, set with 2 = 0.06ct E/F VS natural brilliant/princess cut diamonds. Designed and handcrafted by Robert Pearce, fellow of the prestigious 'Gold & Silversmiths Guild of Australia'. — 18ct yellow gold , including 18ct yellow gold faceted trace chain weighing 4.0 grams.