1.70 Ct. Blue Flash Cabochon Adularescence Moonstone from Ceylon (Sri Lanka)

This listing presents a beautifully translucent 1.70 carat pear shape blue flash moonstone, cut en cabochon to maximize its optical play and tactile elegance. The stone measures 8.75 by 6.14 by 4.25 mm, a dimension set that reads as substantial on the finger or pendant yet remains balanced for refined jewelry design. Clarity is graded as very slightly included when evaluated at eye level, which means the gem maintains a clean visual field to the unaided eye while retaining natural characteristics that confirm its origin and authenticity. Color intensity is light, and the polish is excellent, offering a smooth, satiny surface that accentuates movement and glow. No enhancements have been applied, and the origin is Ceylon, Sri Lanka, a source renowned among connoisseurs for producing moonstones with particularly strong adularescence and stable material quality. For reference within our opal cataloging, the opal type is White Opal, and this piece is offered through The Natural Gemstone Company.

The most arresting feature of this moonstone is its adularescence, the hallmark sheen that appears to float within or just beneath the surface of the cabochon. In this example the adularescence presents as a cool blue flash, sweeping softly across the pear shaped face as the stone or the viewer moves. This soft, floating glow is produced by the interaction of light with microscopic, layered feldspar structures inside the gem, causing light to scatter and interfere in a way that yields a luminous, directional sheen. Because the cutting style is a high dome cabochon with an excellent polish, the adularescence appears uninterrupted and fluid, giving the impression of movement that is both subtle and dramatic. The combination of size and translucency allows the blue flash to develop greater depth and width, creating a visual event that reads as a signature statement when mounted in jewelry.

From the perspective of an educated buyer, the grading details and natural provenance of this stone contribute clear rationale for its valuation. A 1.70 carat weight in a pear shaped cabochon of these dimensions is above average for premium moonstones, allowing designers to craft a focal piece without the compromises that smaller material can impose. The very slightly included clarity grade indicates inclusions that are generally not visible without magnification at standard viewing distance, so the stone maintains visual purity while preserving natural features that are desirable to collectors and lapidaries. Light color intensity enhances the contrast between body tone and adularescent flash, and excellent polish means minimal light loss at the surface, thereby intensifying the internal glow. The lack of any enhancement increases long term value and buyer confidence, particularly for clients who prioritize untreated gemstones and traceable origin.

For design and wear considerations this moonstone is ideal as a single statement center for a ring or a pendant where its pear silhouette and directional flash can be oriented to best advantage. A bezel setting will protect the cabochon and emphasize shape, while minimal prong work can allow more surface exposure to maximize the visual sweep of the blue adularescence. Designers often pair such a White Opal type moonstone with small accent diamonds or white sapphires to frame and reflect the blue flash without overpowering the stone itself. Given its Ceylon, Sri Lanka provenance and untampered condition, this piece suits collectors who value natural phenomena and jewelers seeking a showpiece that reads as both elegant and unmistakably gemological. The Natural Gemstone Company stands behind the description and provenance of this moonstone, and we welcome inquiries about matching stones, mounting options, and bespoke settings to ensure this exceptional cabochon becomes the centerpiece of a lasting and memorable design.