19.4 crt of an Australian Boulder Opal with this stunning oval-shaped gemstone. Measuring 20mm in length and 16mm in width, it presents a captivating circular nut pattern with vivid colour flashes and patterns. A mesmerising play of colours that are intrinsic to this remarkable piece. With a depth of 3mm and a weight of 19.4 carats, It boasts a colour change effect, transitioning smoothly from its natural state to a transformed display of bi-colour or multicolour hues.
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