9.41 Ct. Tourmaline from Ceylon (Sri Lanka)

This specimen is a transparent green tourmaline weighing 9.41 carat, cut to an oval shape with precise dimensions of 14.88 x 12.67 x 8.28 mm, originating from Ceylon Sri Lanka, and offered by The Natural Gemstone Company. The length to width ratio of approximately 1.17 yields a classic oval outline that balances presence with wearable proportions, and the measured depth of 8.28 mm produces a depth ratio of approximately sixty percent relative to the average of the length and width, a proportion chosen to concentrate color without sacrificing light return. The cutter selected a mixed brilliant faceting scheme to marry the contrast and scintillation of brilliant facets on the crown with a more controlled pavilion architecture, maximizing internal reflection for a gem of this dark color intensity. The clarity is graded as very very slightly included when evaluated at eye level, indicating minimal internal features that do not interfere with transparency or light performance, and the polish is excellent, providing crisp facet junctions and minimal surface diffusion of incident light.

The mixed brilliant cut on this oval tourmaline is executed to emphasize both flash and depth, with a well proportioned crown angle and a pavilion faceting layout that channels light back through the table as saturated flashes of deep green. In technical terms, the combination of a moderately deep pavilion and a disciplined crown table ratio enhances contrast scintillation, producing a pattern of light and dark facets that animate as the stone moves. The facet geometry is optimized to work with tourmaline optical characteristics, notably its pleochroism, so that crown facets act as windows to alternate tones, and pavilion facets act as mirrors that reflect concentrated zones of color. Excellent polish ensures facet planes couple efficiently, reducing light leakage and increasing apparent luster, which is critical for darker stones where surface finish greatly affects perceived brilliance.

Comparing brilliance and optical performance to more common gemstones, this green tourmaline behaves differently from both diamond and corundum. Diamond, with its much higher refractive index and dispersion, exhibits superior fire and overall brilliance, producing bright white light return and colorful dispersion under mixed lighting. Corundum, such as sapphire, has a higher refractive index than tourmaline and therefore typically shows stronger return of light and sharper facet contrast in similar cuts. Tourmaline, with a refractive index in the mid one point six range and modest dispersion, does not exhibit the same kind of high fire, but what it does present is a deep, velvety internal glow and dynamic pleochroic color separation, qualities that are especially notable in dark green material. When viewed face up, this specimen offers a saturated, near forest green appearance that can read almost black in low illuminance, yet it reveals lively green flashes and internal flashes of lighter tones under directional lighting, a behavior that distinguishes it from many gem species.

The absence of enhancement on this gem is an important technical and market attribute, the stone is natural, unheated, and not irradiated, which preserves both its provenance character and its long term stability. For connoisseurs who evaluate treatment history as part of value, an unenhanced Ceylon tourmaline of this size and clarity represents a purer example of natural color chemistry and crystal growth conditions. In practical terms, the very very slightly included clarity at eye level means the stone can be set with confidence in exposed settings, as inclusions are minimal and do not compromise the structural integrity or the aesthetic transparency. The origin, Ceylon Sri Lanka, is noted for producing tourmaline with complex color zoning and good crystallographic quality, and this piece exhibits those hallmarks in its consistent saturation and clean optic transmission.

From a setting and design perspective the stone offers multiple technical advantages to a jeweler. The substantial table and generous face up area allow for confident bezel or prong placement, and the depth and mixed brilliant faceting will maintain color intensity when set in either white metal or yellow gold. For designers seeking to enhance perceived brightness, a halo of high dispersion accent stones such as diamonds can provide contrast and lift the apparent green, while a darker metal or warm gold will emphasize the stone density and give a tonal, vintage appearance. For collectors and lapidary specialists who appreciate facet interplay, the cut reveals controlled scintillation and color movement that reward observation, and The Natural Gemstone Company presents this tourmaline as a technical and aesthetic specimen, combining measured proportions, professional faceting, unaltered natural color, and a clarity profile that together produce a substantial, characterful gem suitable for both bespoke jewelry and high level collections.