8.73 Ct. Purple Amethyst from Ceylon (Sri Lanka)

This specimen is a transparent, oval shaped purple amethyst, weighing 8.73 carats, with precise dimensions of 14.28 millimeters by 12.29 millimeters by 8.99 millimeters. The cutting style is faceted, executed as a mixed brilliant cut that combines a faceted crown designed for maximum light return with a more controlled pavilion geometry to enhance color saturation. The gem is evaluated as eye clean at standard viewing distance, showing no visible inclusions to the unaided eye, and it exhibits intense color intensity with a rich, evenly distributed purple tone characteristic of fine Ceylon amethyst. The polish is graded excellent, resulting in crisp facet junctions and mirror like facet planes that contribute directly to optical performance. There has been no enhancement applied to this stone, and the documented origin is Ceylon Sri Lanka, a locale known for producing amethysts with strong, well saturated violet hues. The Natural Gemstone Company presents this gem as a natural, untreated example suitable for collectors and designers who prioritize optical quality and provenance.

From a cutting and proportion perspective, the oval outline of fourteen point twenty eight by twelve point twenty nine millimeters yields a length to width ratio of approximately one point one six, a proportion that preserves the classic oval silhouette while maintaining a balanced face up presentation on the finger or in a pendant. The overall depth of eight point ninety nine millimeters represents approximately sixty seven point six percent of the average diameter, a depth ratio that is intentionally moderate to relatively deep for quartz, designed to avoid the common issues of windowing and washed out color that occur in overly shallow stones. The mixed brilliant execution places a traditional brilliant facet pattern on the crown to break incoming light into multiple internal reflections, while the pavilion uses angular facets that redirect and compress light paths to increase the optical path length within the material. This combination permits effective control over the stone s return of light through the table and crown, producing a balance of brightness, contrast, and color saturation. Facet symmetry is tight, and the girdle appears even, which are essential elements in preserving the intended light dynamics and ensuring predictable behavior when set in metal.

Technically speaking, the way this mixed brilliant cut enhances the inherent properties of amethyst involves manipulation of light entry, internal reflection, dispersion, and exit vectors to optimize perceived color and scintillation. Amethyst is a variety of quartz, with a refractive index in the range from approximately one point five four four to one point five five three, and modest dispersion. The crown s brilliant facet array disperses and scatters incident white light into multiple internal rays, while facet angles on the pavilion are calibrated to promote total internal reflection within the crystal s refractive index window, thereby increasing the probability that light will be returned to the eye rather than lost through the pavilion. Because the pavilion is proportioned to a depth that increases the effective path length of light within the purple chromophore rich zones, the cutter enhances the perceived saturation without artificially deepening hue to the point of appearing black under certain lighting. The mixed cut also produces a lively pattern of scintillation, due to the alternation of larger window facets and smaller star facets on the crown, which creates dynamic flashes of light and dark contrast as the viewing angle changes. This contrast pattern is especially important in gemstones with intense color, because it allows the eye to perceive both depth and brilliance simultaneously, preventing the color from looking flat.

Craftsmanship details such as excellent polish and precise facet junctions contribute in a measurable way to the gem s optical output, because each microfacet acts as a reflector whose specular quality determines how clean and lively the return is. The absence of surface abrasion or polish haze means light encounters a near perfect glassy interface and is reflected without scattering, preserving fine spectral highlights. The eye clean clarity grade ensures that there are minimal internal scatter points that could diffuse or desaturate light transmission, so the amethyst presents its Ceylon purple with clarity and intensity. From a setting perspective, orienting the oval along the finger or pendant axis will accentuate the length to width ratio and display the mixed brilliant pattern to its best advantage, while prong mounting that exposes the girdle and allows unobstructed light entry will maximize brilliance and color return. This amethyst responds well to both solitaire and halo settings where the cutter s proportions can be appreciated, and because it is untreated and originates from Ceylon, it offers a combination of natural color integrity and stable optical behavior that collectors and high end designers seek. The Natural Gemstone Company stands behind the documented origin and the no enhancement condition, and we recommend that this eight point seven three carat oval mixed brilliant amethyst be evaluated alongside mounting mock ups to ensure the final jewelry piece preserves the intended light performance and visual balance.