10.28 Ct. Emerald from Colombia

This Colombian origin emerald offered by The Natural Emerald Company is a transparent 10.28 carat, emerald cut gemstone with dimensions of 15.92 by 11.45 by 8.01 mm. The piece exhibits a vivid color intensity, and is graded slightly included when evaluated at eye level, with standard enhancement recorded. The emerald cut has been executed to emphasize color depth rather than scintillation, with a large rectangular table and classic step faceting that produces broad, parallel facet planes and truncated corners. The length to width ratio of approximately 1.39 produces a balanced face up appearance, while the depth of 8.01 mm corresponds to a depth percentage near 58.5 percent based on the average of length and width, a proportion that preserves generous face up area and a saturated green face up. The polish is excellent, and facet junctions read crisp to the loupe, a testament to controlled lapidary work that retained weight while optimizing optical performance.

From a gemological perspective this emerald shows the expected optical behavior of natural beryl, including modest birefringence and distinct pleochroism, attributes that interact with the step cut to produce its particular visual character. Typical refractive indices for emerald range in the vicinity of 1.577 to 1.583, and birefringence is low, near 0.005 to 0.009, values that correlate with the soft, even light transmission you see in this stone rather than aggressive scintillation. The step facets create broad flashes of light and parallel reflections that emphasize hue and saturation, rather than the pinpoint sparkle common to brilliant cuts. The slightly included clarity grade manifests as small internal jardin type inclusions and feathering that are consistent with high quality Colombian material, inclusions which in this specimen enhance the depth and character of the green rather than detracting from it. The recorded enhancement is standard for emeralds, applied to stabilize fissures and to improve the apparent clarity, and the treatment integrates well with the polish quality to preserve clean facet surfaces and consistent light return.

Lighting response is a critical determinant of perceived value for a vivid emerald, and this specimen performs impressively across a range of lighting environments. Under neutral north daylight or high CRI daylight LED sources, the stone presents its truest vivid green, with a slight leaning toward a bluish green when observed in cool daylight, a characteristic common to Colombian emeralds that carry chromium and vanadium chromophores. In direct sunlight the step facets produce broad, linear flashes of lighter green as the stone is moved, and the large table allows the eye to read saturated color with good depth, while the internal jardin provides a subtle textured backdrop to those flashes. Under warm incandescent light or halogen, the green deepens, taking on a richer, warmer green tone with softer contrast between facet planes, and the stone will appear more enveloping and less contrasty. In mixed indoor LED or display lighting the emerald balances between those behaviors, maintaining vivid saturation while offering controlled flashes along the steps and a supple internal glow. Because emeralds are pleochroic, rotation will yield subtle shifts between bluish green and yellowish green components, an effect that is accentuated by the step faceting and can be used to dramatic effect in movement.

For setting and wear recommendations the cutting proportions and optical character of this emerald suggest designs that maximize face up color and permit light to enter and reflect from the pavilion. Open back or partially open gallery settings will allow the most natural daylight to interact with the pavilion planes, preserving the jewel like depth and lively flashes produced by the step facets. A white metal mounting or a diamond halo will increase perceived brightness by reflecting light into the table and facets, while a low profile bezel will offer security though at the cost of some reduced lateral light ingress. Given the slightly included clarity grade and standard enhancement, Gentle care protocols are advised, avoid steam cleaning and ultrasonic methods that can disturb filled fissures, and prefer mild soapy water and soft brushes for routine cleaning. This emerald is an excellent candidate for a signature central stone in a high end ring or pendant, where its weight of 10.28 carat and exemplary vivid Colombian green will remain the focal point. The Natural Emerald Company stands behind the provenance and craftsmanship noted here, and we can provide further gemological documentation and bespoke setting consultations to ensure this stone is mounted to enhance its optical strengths and long term beauty.