1.05 Ct. Cabochon Chrysoberyl from Ceylon (Sri Lanka)

This oval cabochon is a 1.05 carat chrysoberyl, measuring 5.55 by 5.44 by 3.34 mm, with an appealing yellowish green hue and a medium color intensity. The cut is a traditional cabochon, chosen deliberately for this material to emphasize body color and surface luster rather than faceted brilliance, and the dome presents a well centered apex with symmetrical outlines. Clarity is graded as slightly included at eye level, consistent with natural crystalline growth and minute internal features, and the piece benefits from an excellent polish that brings out an adamantine to vitreous sheen across the dome. There is no enhancement, the origin is Ceylon, Sri Lanka, and The Natural Gemstone Company affirms the natural provenance and the unaltered character of this specimen, which is ready for secure mounting in a ring or pendant where durability and stable color are desired.

From a gemological perspective chrysoberyl is beryllium aluminum oxide with a chemical signature that yields distinct optical and physical properties. Typical refractive indices lie between 1.746 and 1.755, with a modest birefringence on the order of 0.008 to 0.011, and a Mohs hardness of 8.5 which places it well above common wearables while still allowing precise cutting and shaping. Specific gravity is around 3.73, contributing to a substantial feel for a gem of this size. The yellowish green color of this piece is produced by trace element substitutions during crystal growth, most commonly iron in varying valence states, and the medium intensity reflects a balanced concentration of chromophore ions. Under transmitted and reflected light the cabochon displays consistent body color with minor variation when viewed at oblique angles, and pleochroism in chrysoberyl is generally weak, so the cabochon orientation was selected to present the most desirable face up hue.

The cabochon was prepared with deliberate lapidary techniques tailored to slightly included, opaque chrysoberyl, techniques that emphasize material preservation and optical appeal. The cutter oriented the rough to minimize the most conspicuous inclusions at eye level, aligning growth features so that light traverses more homogeneous domains of the crystal, and then shaped the oval outline with controlled laps to establish even thickness and a moderate dome profile. The dome height was balanced to support color saturation while avoiding excessive height that would make the gem appear dark in typical jewelry settings. Abrasive sequences progressed from coarse diamond wheels for initial shaping, through progressively finer diamond laps for smoothing, and finished with specialized polishing compounds applied on felt and leather to achieve the excellent polish reported. Microscopic inspection would show healed growth planes and small mineral inclusions consistent with natural Ceylon chrysoberyl, but the cabochon cut conceals these features in everyday wear while preserving the integrity of the stone.

Geologically this chrysoberyl began its history deep within the crust during episodes of high temperature and pressure that affected the Precambrian terrains of Sri Lanka millions of years ago. Beryllium is a relatively scarce element, and chrysoberyl forms where beryllium rich fluids encounter the right chemical environment and structural openings in host metamorphic rocks. In Sri Lanka such conditions arise during late stage metamorphism and pegmatitic activity, when Be bearing fluids are concentrated in veins and pockets, often associated with granitic intrusions and high grade gneisses. Within those microenvironments crystals nucleated and grew slowly, layer by layer, with trace transition metals incorporated into the lattice to impart the characteristic yellowish green tone. Over geological time these primary deposits were subject to uplift and erosion, the host rocks broke down, and resilient chrysoberyl crystals survived transport and were concentrated in river gravels. Natural tumbling in alluvial systems rounded many crystals, but the piece now presented has been carefully cut to restore form and polish, retaining the memory of its long formation history while being transformed into a gem ready for fine jewelry.

For the informed buyer this 1.05 carat oval cabochon from The Natural Gemstone Company offers a combination of scientific interest and practical wearability. The modest size and measured proportions make it versatile for custom settings where the cabochon dome can be showcased without obscuring the color, and the inherent hardness of chrysoberyl ensures resistance to abrasion for day to day wear. Because the clarity is slightly included at eye level, a bezel or low profile setting will protect the girdle and help conceal any peripheral features that are natural to the material, while the excellent polish maximizes surface luster. No enhancement means predictable long term stability of both color and structure, and provenance from Ceylon adds a layer of geological and historical value appreciated by collectors. If you would like a detailed photographic appraisal, inclusion imaging, or guidance on optimal mounting to preserve and display this chrysoberyl, The Natural Gemstone Company is available to advise on setting style, metal choice, and care recommendations to ensure the gem performs beautifully for generations.