3.63 Ct. Grey Cabochon Moonstone from Ceylon (Sri Lanka)

This listing describes one beautiful translucent 3.63 carat oval grey moonstone, precisely cut as a cabochon and measuring 10.33 by 8.33 by 5.74 millimeters. The gem presents an intense grey color intensity and a clean appearance when viewed at eye level, earning an eye clean clarity grade in our evaluation. The surface displays an excellent polish that enhances the stone’s smooth, domed profile and brings out its internal glow. There has been no enhancement to this material, and its documented origin is Ceylon, Sri Lanka, a well known source for high quality moonstones. At The Natural Gemstone Company we select pieces with transparent provenance and natural condition, and this specimen exemplifies those priorities.

From a gemological standpoint moonstone is a member of the feldspar group, typically occurring as intergrowths of orthoclase and albite that create the characteristic optical phenomenon known as adularescence. Adularescence appears as a soft, billowy sheen or glow that seems to float beneath the surface of the cabochon and is best displayed in stones that are well cut, translucent, and finely polished. The cabochon cutting style used for this oval moonstone is the traditional choice for maximizing adularescence, because the rounded dome allows light to interact with the internal lamellar structure and produce the shifting sheen. The eye clean clarity grade reported here indicates that no inclusions or fractures are visible to the naked eye under normal viewing conditions, which is desirable for collectors and designers who prioritize visual purity and optical performance.

Durability is an important consideration when selecting moonstone for jewelry, and on the Mohs hardness scale moonstone typically registers between 6 and 6.5. To put that in perspective diamond is a 10, sapphire and ruby are 9, and quartz is 7. The Mohs rating for moonstone means it is less hard than many more wear resistant gems and therefore more susceptible to abrasion and surface scratching if worn daily without protection. For this reason cabochon moonstones of this quality and size are ideal for pendants, earrings, brooches, or rings that employ protective settings such as bezels that shield the girdle and edges. We advise against aggressive cleaning methods, ultrasonic or steam baths, and exposure to harsh chemicals or prolonged heat. Gentle cleaning with warm water, mild soap, and a soft brush, followed by drying with a soft cloth, preserves the polish and adularescence. Proper setting and care will ensure this gem retains its visual appeal for many years.

For the educated buyer this 3.63 carat Ceylon moonstone represents strong value because of its combination of size, translucency, intense color, natural state, and excellent polish. Sri Lanka is renowned among connoisseurs for producing moonstones with superior adularescence and stable color, which increases desirability in both the collector and designer markets. The dimensions 10.33 by 8.33 by 5.74 millimeters give the stone a substantial face up presence without being oversized, and the cabochon height delivers depth that reads well in bezel and halo settings alike. Design recommendations for maximizing both beauty and wearability include mounting in a protective bezel in 14k or 18k gold for a warm contrast that flatters grey tones, or in sterling silver for a contemporary, luminous presentation. For ring use we suggest a low profile bezel and a setting that minimizes edge exposure. For those who collect, this piece is attractive because it is untreated and eye clean, attributes that tend to hold market preference and resale potential. At The Natural Gemstone Company we are available to provide additional measurements, high resolution imagery, and a formal report if you require documentation for appraisal or certification.