2.28 Ct. Multi Color Cabochon Semi-Black Opal from Australia

This semi black opal from Australia is a finely presented natural gemstone, weighing 2.28 carat, with an oval shape and precise dimensions of 12.94 x 6.19 x 4.39 mm, cabochon cut to optimize the play of color, and finished with an excellent polish. As a Semi Black Opal, it exhibits a darkened body tone that intensifies the spectral colors, while remaining opaque in nature, which gives it a deep and dramatic appearance. The color intensity has been evaluated as intense, with vivid flashes of green and blue across the surface and subtle shifts that reveal secondary hues as the gem is rotated. Importantly, this specimen is untreated, no enhancement, confirming that the optical properties are wholly natural and derived from the opal microstructure that forms in Australian deposits. The Natural Gemstone Company is presenting this stone with full disclosure of provenance and characteristics, to support an informed acquisition by collectors and connoisseurs.

From a grading and clarity perspective, opal assessment differs from transparent gems, yet the same principles of quality apply, clarity meaning the absence of unwanted fractures, potch, or significant inclusions that interrupt the play of color. This particular opal is notable for its clean appearance and uniformity beneath the cabochon dome, with no visible cracks or stability concerns, which contributes to both beauty and long term integrity. The cabochon cut is expertly proportioned, the dome height of 4.39 mm offering ideal depth to reveal internal fire, while the 12.94 by 6.19 mm outline maintains a pleasing length to width ratio for elegant settings. The excellent polish enhances surface reflection and allows the play of color to read with maximum contrast against the darker body tone. From every viewing angle the strong color patches and gliding streaks remain coherent and lively, a sign of consistent internal structure and superior lapidary work. When mounted, this stone will present dynamic color at slight movements, responding to ambient light and the wearer motion, which is the hallmark of high quality opal.

For the educated buyer, value is derived from a combination of weight, color quality, origin, treatment status, and lapidary execution, and this opal ranks highly on each axis. Australian origins remain the benchmark for premium opals, and a natural, untreated Semi Black Opal of intense color in a well executed oval cabochon is a sought after commodity in both the jewelry and collector markets. The 2.28 carat weight provides a substantial visual presence without compromising setting options, making it suitable for a range of bespoke designs including rings, pendants, and artisan mounts that protect the stone while showcasing its iridescence. Durability is enhanced by the solid cabochon proportions and the lack of structural flaws, and routine care involves avoiding sudden temperature shifts and physical impacts, storing separately to prevent abrasion, and cleaning with a soft damp cloth. At The Natural Gemstone Company we provide clear documentation of origin and characteristics, and we encourage buyers to consider the long term desirability of natural, untreated opals when selecting a gem. This Semi Black Opal represents a compelling synthesis of natural rarity, skilled cutting, and aesthetic refinement, a gem that will reward an informed owner with persistent beauty and investment potential.