Opal Oval Shape Cabochon. Great Size - Fine Color Quality. Weight: 8.42 ct Size: 20.50 x 11.90 x 6.60 mm. Color: White base with a vivid play of colors. Luster: Multicolor. Treatment: No indications of treatment. ALGT Certificate Report no. 11531776. Top gem - Great size, perfect for a centerpiece - Top luster - Mentioned by the Lab as well as a 'Fine Color Quality' gem. Unique to Opal, ‘play of color’ is the attractive flashes of colorful brilliance that change with the angle of observation. An Opal with a play of color with three or more hues is called ‘a multicolor’. October’s birthstone, Opal is from the Greek ‘opallios’, meaning ‘to see a change Shipment with a reliable service provider will be trackable and will be insured. Duties and taxes will be the Buyer's responsibility. IMPORTANT: The pictures were taken under white and yellow light with magnification on different backgrounds, intended to be displayed as accurately as possible. We have tried our best to capture as real colors/luster as possible, but they may slightly differ.