GIA-certified 5.10 carat natural black opal with no color treatment, displaying vivid full-spectrum play-of-color, set in a four-prong platinum 900 mounting within a starburst single-row round brilliant diamond halo totaling 0.77 carats.

Ring size 6.5, adjustable.

This 5.10 carat GIA-certified natural black opal is an extraordinary gemological specimen — its dark body tone provides the ideal backdrop against which its play-of-color blazes with maximum intensity, displaying vivid patches of electric green, cobalt blue, violet-purple, golden yellow, and orange that shift and dance with every movement under light. Black opals are the rarest and most valuable variety of opal in the world, found almost exclusively in Lightning Ridge, New South Wales, Australia, and prized by collectors precisely because their dark body tone makes the play-of-color appear more vivid and saturated than in any other opal type. GIA certification with no color treatment confirmed is the highest standard of provenance for a natural opal, guaranteeing that the stone's spectacular color display is entirely natural and unenhanced. The 18 round brilliant diamonds totaling 0.77 carats in the starburst halo provide a sparkling white frame that intensifies the opal's color play by creating a high-contrast border of white light around the stone.