15.24 Ct. Purple Amethyst from Brazil

This 15.24 carat oval amethyst presents as a study in proportion and optical precision, with dimensions of 18.45 by 13.98 by 10.14 millimeters that provide a commanding face up silhouette while maintaining comfortable depth for jewelry settings. The gem is transparent with intense purple saturation and an eye level clarity described as very slightly included, making it an ideal candidate for pieces where both color and brilliance are paramount. Cut to a mixed brilliant specification, this amethyst combines a well balanced, moderately sized table with a faceted crown designed to disperse light into lively flashes, and a pavilion geometry engineered to return that light through a sequence of internal reflections. The excellent polish across all facets enhances luster and facilitates crisp facet junctions, while the absence of any enhancement confirms the stone s natural provenance from Brazil as presented by The Natural Gemstone Company.

The geometric faceting strategy employed in this stone is deliberately calculated to maximize light play within the constraints of an amethyst s refractive properties. The mixed brilliant design integrates a brilliant style crown, with star facets and bezel facets organized to admit and break incident light into scintillation, and a modified step pavilion that functions as a layered mirror, guiding light back to the eye in controlled pulses. This interplay between small, high angle crown facets and elongated pavilion facets creates a dynamic return of contrast and brilliance, producing both broad flashes and pinpoint scintillation as the gem is rotated. Symmetry is tightly maintained across the oval outline, with even facet proportions along both the length and width axes, which minimizes light leakage at the girdle and preserves a uniform, intense face up color. The result is a gem that reads as both vivid and lively, delivering maximum perceived brightness without sacrificing the deep purple tone that distinguishes premium amethyst.

Color and clarity are addressed with technical precision, reflecting the gemological characteristics that informed the cutting choices. The intense color intensity is preserved by controlling table size and pavilion depth, allowing sufficient path length for color saturation while still enabling efficient light return. Very slightly included clarity at eye level indicates the presence of minimal, well distributed internal features that do not interfere with transparency or with the controlled optical paths produced by the facet architecture. These minor inclusions are effectively masked by the gem s strong color and by the reflective patterns produced by the mixed brilliant geometry. From a material standpoint, amethyst belongs to the quartz family, with a refractive index range near 1.544 to 1.553, a birefringence of approximately 0.009, and a specific gravity around 2.65, attributes that influenced the cutter s selection of facet angles to optimize internal reflection and minimize extinction. The gem s hardness of seven on the Mohs scale provides durable wearability for rings and other everyday jewelry, while the excellent polish protects facet crispness and enhances perceived depth.

Presented by The Natural Gemstone Company, this Brazilian amethyst is sold with full disclosure of its natural, untreated status, and with documentation of its measured dimensions, carat weight, cut class, clarity grade, and polish assessment. The stone s oval outline and calibrated facet arrangement make it especially suitable for classic solitaire rings, statement pendants, and bespoke settings where the cutter s careful balance of crown and pavilion geometry can be appreciated. Care recommendations include avoiding prolonged exposure to strong heat and chemical solvents, and cleaning with warm soapy water and a soft brush to preserve polish and color. For clients seeking a gem with demonstrable technical refinement, this 15.24 carat mixed brilliant oval amethyst offers a compelling combination of intense natural color, engineered light performance, and precision finishing, reflecting the quality standards upheld by The Natural Gemstone Company.