Black opals are the rarest variety of opal and also the most valuable due to their dark body tone that enhances the richness of colors within them. Warm colors within black opals like yellow, orange, pink, and red are less common than cool colors. As a result, the more warm colors present, the higher the value. Strong red play of color in a black opal is the most valuable combination and that is exactly what this beauty exhibits. This stunning specimen weighs 5.76 carats and it is flanked by round brilliant cut diamonds. This magnificent stone is set in rich 18k yellow gold for a truly striking ring. This spectacular opal is remarkable for its rarity, intense play of color as well as its size.