0.38 Ct. Bi Color / Parti Sapphire from Ceylon (Sri Lanka)

This oval 0.38 carat bi color parti sapphire measures 5.31 x 3.91 x 2.13 mm, and displays a transparent body with medium color intensity and a mixed brilliant faceting schema, and its measured depth is approximately 46.2 percent when calculated from the average of length and width, and it presents an excellent polish with a clarity grade of very slightly included evaluated at eye level. The mixed brilliant cut here has been executed with a brilliant style on the crown to maximize return of incident light through small, kite shaped and star facets, and with carefully arranged pavilion facet planes that prioritize light return while managing the stone s color zoning. The table has been proportioned to produce a pleasing balance between face up brightness and preservation of the parti color distribution, and the facet junctions and girdle transitions show careful symmetry that reduces light leakage and visible feathering in the face up view. No enhancement has been applied to this natural Ceylon sapphire from Sri Lanka, and the absence of heat or diffusion treatment preserves the original pleochroic and parti characteristics that are intrinsic to the crystal s growth environment.

When comparing its brilliance to more common gemstones, it is important to consider the inherent optical constants of corundum, which include a refractive index around 1.76 to 1.77 and a modest birefringence that produces pleochroism rather than the extreme dispersion seen in diamond. Against diamonds, the sapphire will not exhibit the same high dispersion or fire, however the mixed brilliant faceting and shallow to medium depth together produce an intense face up brightness and lively scintillation that is unique among colored stones, and that appears more dynamic than many commercial quartz or topaz examples. Compared with common blue stones such as commercial blue topaz or aquamarine, this Ceylon sapphire offers a denser optical saturation per facet and a more persistent brilliance under variable lighting because corundum s higher refractive index yields stronger internal reflection, and because the cutter has oriented facets to align with the stone s pleochroic axes, the parti nature presents contrasting zones of blue and near colorless material that create internal contrast and directional flash. The result is a gem that reads brighter in face up orientation than similarly sized stones of lower refractive index, and which simultaneously displays color complexity that changes with viewing angle.

From a craftsmanship and connoisseurship perspective, this sapphire exemplifies deliberate decision making during cutting, including deliberate pavilion angling to mitigate the natural color banding while preserving as much weight as practical, and a crown faceting pattern that emphasizes small, repeated facets to increase scintillation frequency without causing excessive fire, which is minimal in corundum. The cutter s approach favors balanced symmetry and tight facet junctions to maintain excellent polish and to reduce surface diffusion of light, which preserves contrast between the parti zones. Clarity at the very slightly included level evaluated at eye level indicates that inclusions are minor and do not materially affect optical performance, and the lack of enhancement confirms the stone s original lattice chemistry and zoning as formed in Ceylon Sri Lanka. For the buyer who appreciates technical refinement, this stone offers an opportunity to acquire a naturally partitioned sapphire with carefully executed mixed brilliant faceting that accentuates both brightness and pleochroic color variance. The Natural Sapphire Company presents this piece as an example of material where geological origin and cutter expertise converge to produce a compact yet visually complex sapphire, suitable for a precision setting that will highlight its oval proportions and parti character.