Opal Oval Shape Cabochon. Great Size - Fine Color Quality. Weight: 5.50 ct Size: 13.79 x 10.27 x 7.63 mm. Color: White base with a vivid play of colors. Luster: Multicolor. Treatment: No indications of treatment. ALGT Certificate Report no. 87298502. Top gem—Great size, perfect for a centerpiece—Top luster—The lab mentioned it 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, comes from the Greek ‘opallios’, meaning ‘to see a change Shipment with a reliable service provider will be trackable and insured. Duties and taxes will be the Buyer's responsibility. IMPORTANT: The pictures were taken under white and yellow light with magnification on dark backgrounds, intended to be displayed as accurately as possible. We have tried to capture as many real colors/lusters as possible, but they may differ slightly.