58.45 Ct. Cabochon Lapis from Afghanistan

This specimen is a single, opaque, oval shaped lapis, weighing 58.45 carat, measuring 24.76 by 17.70 by 16.25 mm, cut as a classic cabochon, with an excellent polish and no enhancements. The deep blue body color demonstrates the characteristic ultramarine to ultramarine blue that connoisseurs associate with high quality Afghan lapis. Color intensity is not applicable in the strict sense used for transparent gemstones, yet the visual saturation of this material is equivalent to a top grade in lapis grading schemes. In addition to the rich blue matrix, fine golden flecks of pyrite are distributed across the surface and just below the polished dome, providing both a useful indicator of natural provenance and an aesthetic contrast that amplifies perceived depth. The cut is a full dome oval cabochon, with careful attention given to symmetrical outline, even dome height and balanced proportions relative to the stone dimensions, resulting in a stable visual center and a pleasing optical mass for use in a statement ring or pendant.

The geological and mining story of this lapis begins in the high carbonate rich metamorphic belts of Afghanistan, where low grade metamorphism and contact metasomatism produced the silica poor, lazurite rich assemblages that yield lapis lazuli. The rough was extracted by small scale artisanal operations, using controlled blasting and hand splitting to preserve larger nodules. Early stage sorting at the mine site separated highly chromatic pieces from more calcitic material, with the best sections being set aside for lapidary selection. Our field partners conduct an initial appraisal on site, recording nodular textures, pyrite distribution and the absence or presence of calcite veining. For this particular piece, the rough displayed a dense, homogeneous blue and a desirable pyrite pattern, which made it a prime candidate for a large oval cabochon. Transport from mine to workshop followed secure, documented chains of custody, allowing laboratory grade provenance notes to accompany the gemstone when it arrived at our cutting facility.

At the cutting bench the lapidary workflow for this cabochon emphasized preservation of color saturation and maintenance of natural pyrite highlights. Preforming began with orientation analysis, choosing the principal axis that maximized the visual weight of ultramarine zones while minimizing any peripheral calcite inclusions. Coarse profiling removed excess material, then progressive grinding stages refined the oval outline and established the dome height approximately proportional to the stone length, preserving a pleasing ratio between crown curvature and girdle width. The cabochon grade cut is intact, meaning facets were not applied, the optical character relies on the smooth convex surface to distribute light across the lazurite matrix. Fine grinding and pre polishing removed subsurface saw marks and achieved a uniform satiny surface, before final polishing produced an excellent mirror like finish. Final polish techniques used a lapidary polish that enhances blue saturation without introducing residual abrasives that could dull the pyrite specks. The result is a cabochon with exceptional surface integrity, consistent polish across the dome, and edge transitions that are clean and well rounded to facilitate setting.

From the workshop the finished stone was catalogued and photographed by The Natural Gemstone Company, where detailed measurements and a written description accompany the lot. The journey from high mountain outcrop to meticulously cut cabochon underscores provenance, craftsmanship and transparency in enhancement disclosures. Because there are no treatments applied, the lapis retains its natural mineralogy and visual behavior, attributes that collectors and jewelers prize in larger parcels. The weight and dimensions make this piece ideal for a bezel set ring, a high profile cocktail ring, or a substantial pendant, where the oval cabochon can be mounted to emphasize the central ultramarine mass and distribute the pyrite highlights across the visual field. In practical terms the stone is durable for jewelry use, requiring the expected care for lapis which is sensitive to strong acids and prolonged exposure to heat and harsh abrasives, therefore settings that protect the girdle and allow occasional professional cleaning are recommended. The Natural Gemstone Company stands behind the documented origin and the no enhancement statement, and can provide additional technical information on lapidary processing, setting recommendations, or provenance documentation upon request.