10.40 Ct. Cabochon Moonstone from Ceylon (Sri Lanka)

One exquisite translucent grey moonstone, weight 10.40 carats, shape round, dimensions 12.45 x 12.60 x 9.20 mm, cut cabochon, clarity grade very slightly included as evaluated at eye level, color intensity medium light, polish excellent, enhancement none, origin Ceylon Sri Lanka, offered by The Natural Gemstone Company. These concise specifications are presented up front so you can immediately appreciate the rarity and the precise character of this gem. The weight of 10.40 carats in a round cabochon of these dimensions gives a pleasing presence, substantial without overwhelming a refined setting. The very slightly included clarity means that the gem reads as clean to most viewers, while still retaining the natural fingerprint and inner texture that make moonstones living, organic objects. The excellent polish ensures a smooth, glassy surface that enhances the gem fluidly under changing light, while the lack of any enhancement confirms you are seeing the stone exactly as nature produced it.

Visually this moonstone displays a soft, cool grey body color with a delicate internal glow that shifts with the angle of light. The cabochon cut has been expertly shaped to concentrate and show adularescence, that subtle, moonlit sheen that seems to float just below the surface. Against direct light the cabochon reveals gentle highlights and a luminous band that moves as the stone is tilted, creating a calming, almost hypnotic effect. Under softer ambient light the grey takes on warmer undertones, allowing the stone to harmonize with both cool and warm metal settings. The medium light color intensity gives the gem versatility, it can stand as the star of a minimal bezel setting or it can complement an intricate design with accent stones. The very slightly included clarity is consistent with natural moonstone structure, and these minor inclusions do not detract from the overall visual appeal. The excellent polish and rounded dome make this cabochon comfortable to wear, and the smooth top surface offers a tactile luxury when used for rings or pendants.

From a design and practical perspective this 10.40 carat Ceylon moonstone is a superb candidate for a statement ring, a pendant with an open back to allow light to pass, or an artisanal piece with mixed metal elements. The size, at just over twelve millimeters in diameter and nine millimeters in depth, balances presence and wearability, fitting well into classic ring heads and pendant cups alike. We recommend settings that protect the girdle and dome while allowing the adularescence to be admired, a bezel with a slightly raised edge or a secure prong arrangement that keeps the stone safe in daily wear. Because this moonstone has no enhancements, it will age naturally, and its surface maintains the excellent polish applied by the lapidary. For pairing, consider soft metals such as rose gold to warm the grey, white gold or platinum for a modern cool palette, and sterling silver for a classic, artisanal aesthetic. Accent stones in white or subtle pastel shades will complement without overpowering the moonstone, allowing its internal glow to remain the focal point.

At The Natural Gemstone Company we pride ourselves on presenting gemstones with transparent, detailed information so you can buy with confidence. The provenance from Ceylon Sri Lanka is significant, as Sri Lankan moonstones are celebrated for their clean adularescence and fine polish potential. No enhancement is listed because this gem has been left in its natural state, and that natural integrity is important to collectors and designers who value authenticity. For care, avoid prolonged exposure to high heat, harsh chemicals, and ultrasonic or steam cleaning methods, instead clean gently with warm soapy water and a soft cloth. If you would like additional photographs, views under different lighting, a close up showing the inclusions as evaluated at eye level, or assistance with custom mounting ideas, our team is ready to assist. Contact The Natural Gemstone Company to discuss secure shipping options, bespoke setting services, or to request a consultation with our gem experts, we are committed to helping you select the perfect setting that celebrates this moonstone while preserving its natural beauty.