11.54 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

This listing details a single translucent grey moonstone weighing 11.54 carat, with an oval outline and finished as a traditional cabochon, dimensions 15.29 by 12.74 by 8.32 mm, origin Ceylon Sri Lanka, enhancement none, clarity grade very very slightly included evaluated at eye level, color intensity very light, and an excellent polish. The body color reads as a subdued grey with subtle milkiness that allows a soft internal sheen to manifest when light is incident on the dome, the translucency permitting moderate light transmission while preserving the classic adularescent effect associated with high quality Sri Lankan material. The cabochon form emphasizes a smooth, continuous dome, the oval symmetry is well controlled and the profile height has been calibrated to balance optical play with wearability, these proportions support an even adularescent band across the central axis when set in typical jewellery orientations. At The Natural Gemstone Company this stone is presented with provenance and cutting notes, the lack of treatment is a material attribute that preserves the natural inclusion structure and optical response of this moonstone.

From a cutting and craftsmanship perspective the cabochon exhibits careful lapidary control and a polished surface finish commensurate with the excellent polish grade. The dome exhibits a conservative height to diameter ratio which is optimized to produce a steady adularescence rather than a concentrated, narrow sheen, the cutter oriented the basal cleavage and the albite lamellar structure to run roughly parallel to the long axis of the oval, this orientation enhances the parallelism of the adularescent band with the oval axis. Surface topology is free from lap lines and complex undulations, the polish reflects a high degree of material removal control and finishing with fine abrasives that typically include progressively finer silicon carbide on preforms and an oxide based final polish, the resulting surface yields crisp highlights and minimal diffusion of reflected light, this is particularly important for moonstone where surface quality directly affects the perceptibility of the adularescent sheen. Edge symmetry around the girdle zone is smooth and consistent, the transition from rim to dome is even, this eases bezel seating and reduces the need for excessive metal work during mounting.

The clarity grade described as very very slightly included at eye level indicates that inclusions are present but limited in size and number, these are most often thin needle like inclusions or microscopic growth zoning within the albite host, the inclusions contribute to the gem s natural character without materially impairing light transmission or the quality of the adularescence. Under standard viewing conditions the stone reads as clean to the naked eye, with the inclusions requiring magnification to be readily detected, the internal features scatter light subtly and can enhance the diffuse sheen in some viewing angles rather than creating disruptive inclusions that obscure the adularescence. The very light body color offers low contrast between the adularescent band and the surrounding material, this yields a soft, ethereal effect characteristic of grey moonstones from Sri Lanka, collectors and designers who favor understated optical phenomena will appreciate the balance between translucency and sheen present in this piece. The absence of enhancement means the color and clarity are natural to the material, this is significant for buyers who prioritize untreated gemstones for their collections or bespoke jewellery commissions.

In terms of practical use and care the 11.54 carat oval cabochon is well suited to a variety of settings, the dimensions and dome profile make it adaptable to rings, pendants, and brooches where a secure bezel or low profile prong setting will protect the dome and display the adularescence across the main viewing plane. For ring applications a bezel setting provides the best protection for the cabochon s high dome, a well executed bezel also complements the oval outline and preserves the stone s visual continuity, pendant or brooch settings can exploit the larger surface area to showcase the adularescent flow. Moonstone has a Mohs hardness of approximately 6 to 6.5 so care should be taken to avoid sharp impacts and abrasive contact, cleaning should be performed with warm water, a mild detergent, and a soft brush, prolonged exposure to high heat or harsh chemical cleaners should be avoided as these conditions can alter surface polish or affect included structures, ultrasonic cleaners and steam cleaning are not recommended for gemstones with natural cleavage or lamellar structures. At The Natural Gemstone Company we stand by the stated characteristics and provenance of this moonstone, we can provide additional imagery and viewing angle studies upon request, please contact us for bespoke mounting recommendations, parcel shipping options, and any certification details you require.