5.31 Ct. Cabochon Malachite from Russia

This listing presents a single opaque green malachite, oval in outline, weighing 5.31 carats, with exact dimensions 12.06 x 10.10 x 4.36 mm. The cutting style is classic cabochon, executed to emphasize the natural banding and zonation inherent to high quality malachite. The piece displays an intense range of green tones from light to deep forest green, with crisp, parallel banding and occasional concentric growth rings that form a visually coherent pattern across the dome. Color intensity is noted as n a, yet the perceptible saturation and contrast between the lighter and darker bands is strong, producing excellent visual depth for an opaque material. The polish is rated excellent, providing a reflective, glass like surface that accentuates both color and pattern without introducing false luster from surface treatments. The origin is Russia, and the specimen is offered with no enhancement.

From a lapidary perspective this cabochon demonstrates careful preforming and controlled dome height to balance optical display and structural integrity. The oval outline is true, with proportional length to width ratio maintained to reduce stress concentration at the ends during setting. The dome profile is moderately high, which allows the banding to wrap elegantly around the crown, while the pavilion is uniformly thinned to 4.36 mm to achieve the target overall weight of 5.31 carats. Surface finishing was completed with progressively finer abrasives and a final polish on a felt lap using a rare earth oxide compound, resulting in a smooth surface free of polish lines, pits, or nap. Edge work at the girdle has been smoothed to avoid sharp transition points, an important detail for cabochons intended for bezel settings. Under loupe inspection at ten times magnification the band boundaries are tight and continuous, and there are no indications of filler materials or surface coatings.

Material characteristics are consistent with high quality malachite sourced from Russia, with dense microcrystalline structure and well developed banding produced by rhythmic precipitation of secondary copper carbonates. The mineral exhibits an opaque diaphaneity, and as such optical phenomena typical of transparent gems are not present, rather the appeal lies in structural pattern and color stratification. Hardness on the Mohs scale is modest, approximately three and a half to four, so practical considerations for jewelry use include selecting protective settings and avoiding abrasive contact. The stone is untreated, with no stabilization dyeing or resin impregnation reported, and no heat or irradiation applied, making this a natural gem in both origin and appearance. Routine care should exclude ultrasonic cleaners and steam, and cleaning should be performed with mild soap, water, and a soft cloth, to preserve the excellent polish and avoid surface scratching.

For design integration this malachite cabochon is well suited to classic bezel rings, pendant settings with protective bezels, and inlay work where the banding can be matched with other stones for continuity. The oval 12.06 by 10.10 mm dimensions allow for balanced placement in both unisex and statement designs, and the moderate dome height provides visual presence without excessive profile. Makers will appreciate the predictability of the cabochon profile when planning bezels and mountings, and the excellent polish reduces the need for post setting finishing. At The Natural Gemstone Company we evaluate each specimen for cut quality, surface finish, and natural character, and this Russian malachite cabochon conforms to high standards for collectors and designers who value unenhanced material. If you require additional magnified imagery or technical measurements for CAD modeling, we can provide high resolution images and exact profile traces upon request.