0.21 Ct. Bi Color / Parti Sapphire from Montana

This listing describes one transparent 0.21 carat round shape bi color parti sapphire, supplied by The Natural Sapphire Company, with measured dimensions of 3.48 x 3.46 x 2.47 millimeters. The gem is faceted in a mixed brilliant style, combining a brilliant facet arrangement on the crown with controlled step style planes on the pavilion. The cut is optimized for a small round stone, with an overall depth that measures approximately 71 percent of the average diameter, delivering a balance between color saturation and light return. The gem presents with medium color intensity, an excellent polish, and clarity graded as very slightly included when evaluated at eye level. The stone has been heat treated, a commonly applied and permanent enhancement, and its provenance is Montana.

The geometric faceting of this mixed brilliant cut is designed to maximize internal light play through a considered relationship of table size, crown angle, and pavilion depth. The brilliant crown facets act to scatter incoming light and generate scintillation, while the stepped pavilion facets function to redirect and concentrate light back through the crown. The result is a dynamic interplay between brilliance and color flash, with facet junctions cut to precise angles to encourage bright return of white light and discrete colored flashes. The nearly equal girdle diameter contributes to symmetrical light distribution, and the slightly greater depth enhances the saturation of the parti color without unduly compromising face up brightness.

Color behavior in this bi color parti sapphire is articulated by the mixed faceting, which alternately reveals warmer and cooler tones as the stone is rotated and viewed under varying illumination. With medium color intensity, the gem exhibits distinct but balanced zones of color, and the facet geometry emphasizes the parti character by creating areas of concentrated color while maintaining overall transparency. The very slightly included clarity grade indicates minor internal features that do not interrupt the gemetic transparency at typical viewing distances, and the excellent polish supports crisp facet reflections and clean light transmission. Together these attributes produce a stone that reads as transparent and lively, with parti coloration that is both identifiable and evenly moderated by the cutter.

Practical specifications are given for clarity in design and setting decisions. The stone weight is 0.21 carat, dimensions are 3.48 by 3.46 by 2.47 millimeters, cutting style is faceted mixed brilliant, clarity is very slightly included at eye level, color intensity is medium, polish is excellent, enhancement is heat treated, and origin is Montana. The cutter prioritized geometric precision to maximize light performance in a compact round form, making the stone suitable for precision settings where optical performance is a primary consideration. The Natural Sapphire Company provides these measured and evaluated details to assist in objective assessment of the gem, and to facilitate accurate comparisons with other stones for design and appraisal purposes.