0.67 Ct. Green (Lime Green) Peridot from Ceylon (Sri Lanka)

This listing describes a single transparent peridot, 0.67 carat, cut to an emerald shape with dimensions of 5.93 by 3.98 by 3.02 millimeters. The stone presents a clear lime green hue with medium color intensity, evaluated without enhancement and originating from Ceylon Sri Lanka. Clarity is graded as very slightly included, evaluated at eye level, and the finish exhibits an excellent polish. These specifications reflect the gem as presented by The Natural Gemstone Company, and they summarize the measurable attributes that define its appearance and suitability for precision jewelry settings.

The characteristic sparkle of this peridot is a direct consequence of its crystallographic and optical properties. Peridot belongs to the olivine group, a magnesium iron silicate that crystallizes in the orthorhombic system. That internal lattice arrangement produces a biaxial optical character, with refractive indices that typically fall in the range of approximately 1.65 to 1.69, and a birefringence on the order of 0.036. Those values mean that light entering the stone is both strongly refracted and split into slightly different velocity paths within the crystal, creating distinct internal contrasts and crisp facet definition. The result is a brilliance that emphasizes strong, well defined flashes along facets, rather than the more dispersed, scintillating sparkle seen in higher dispersion gems. In practical terms the peridot returns light with a bright, lucid quality, and the slightly higher refractive index relative to many common gem materials contributes to a visual intensity that reads as vivid and clean. Because this example is natural and untreated, the optical response observed in hand reflects the gem in its native state, without the alteration to internal boundary conditions that treatments can introduce.

The choice of an emerald cut amplifies the gemological expression of the peridot by translating its optical constants into a specific light pattern. The emerald cut uses broad step facets that are aligned parallel to the crystal axes, producing broad flashes of color and light that march across the table and crown as the stone moves. For a stone with the peridot s refractive and birefringent profile, those step facets produce a distinctive combination of bright central flash and crisp linear reflections along the shoulders, enhancing perceived color saturation while maintaining a clean, architectural appearance. The dimensions of five point nine three by three point nine eight by three point zero two millimeters, together with the excellent polish, indicate precise facet junctions and smooth facet planes, which minimize unwanted diffusion and maximize directional light return. The clarity grade very slightly included, evaluated at eye level, ensures that inclusions do not significantly interrupt the light pathways that generate the characteristic flashes, and in many cases they contribute subtle character without degrading the gem s optical performance.

In summary, this Ceylon peridot offers a defined and technically appealing optical presentation. Its inherent mineral structure imparts a strong refractive response and measurable birefringence, which combined with the step geometry of the emerald cut yields an unmistakable pattern of broad, crystalline flashes and clear tonal saturation. Because the gem is unenhanced, its visual properties are those of the natural material, and the excellent polish secures optimum light return and facet crispness for use in bespoke settings. The Natural Gemstone Company presents this piece for consideration by designers and connoisseurs who seek a peridot whose sparkle and proportions reflect both its geological origin and careful lapidary execution.