4.95 Ct. Multi Color Cabochon Black Opal (Dark Opal) from Ethiopia

This Black Opal, also called Dark Opal, is a translucent 4.95 carat oval cabochon measuring 14.25 x 11.64 x 7.29 mm, and its optical structure is the fundamental reason the gem displays a sparkle that is unmatched by many other gemstones. Opal is a hydrated silica material composed of submicroscopic silica spheres arranged in a regular three dimensional lattice, and when light encounters this ordered array it diffracts into spectral colors. The size and uniformity of the spheres in this specimen favor strong diffraction in the green and red regions, producing lively multicolor flashes against a dark body tone. The dark body tone of black opal increases contrast and perceptible brightness, making play of color appear more saturated and intense. The cabochon cutting style and the well executed dome allow light to enter at shallow angles, encouraging multiple internal reflections and maximizing the visible color shifts. With an excellent polish, surface scattering is minimized so that diffraction driven play of color reads with clarity and depth. The gem has a clarity grade of very slightly included when evaluated at eye level, and these minor internal features do not interrupt the play of color or structural diffraction, they instead add character without detracting from the stone brightness. No enhancement has been applied to this piece, preserving its natural internal lattice and optical properties.

From a grading and provenance perspective this black opal from Ethiopia offers attributes that an educated buyer will value. The dark color intensity and excellent polish are two strong contributors to both aesthetic appeal and market value, while the 4.95 carat weight and substantial dimensions place the stone in a size category that is relatively rare for high contrast black opal specimens. Important grading criteria for opal include body tone, play of color brightness, pattern and distribution, clarity and treatment status, and this gem scores highly across those factors, with vivid color play, even distribution across the surface, minimal eye level inclusions, and a transparent statement of no enhancement. Ethiopian origins are increasingly respected in the trade for producing vibrant dark opals, and our documentation at The Natural Gemstone Company confirms origin and natural condition. For connoisseurs seeking a technically interesting gem with demonstrable optical physics and collector grade characteristics, this Ethiopian Black Opal represents a measured and verifiable investment in natural color, structure and craftsmanship.