1.27 Ct. Bi Color Sapphire from Madagascar

This specimen is a transparent, one point two seven carat round bi color sapphire, with measured dimensions of six point four five by six point four three by four point zero nine millimeters. The cutter executed a mixed brilliant cut, combining a brilliant style crown with an optimized pavilion scheme to balance scintillation and color saturation. Proportions yield an overall depth of approximately sixty three point four percent, which contributes to strong internal reflection and a concentrated color appearance without sacrificing dispersion. The diameter variance between the two measured axes is minimal, indicating precise symmetry and a well centered table that supports consistent light return across viewing angles. The polish is graded excellent, with facet junctions rendered crisply and no visible surface abrasions, so the stone presents high contrast patterning and lively facet flashes under directional lighting.

Optically the stone displays vivid color intensity with a clear bi color zoning that transitions between golden yellow and a subtle greenish yellow depending on orientation and incidence of light. The bi color character is a function of zonal variations in trace element chemistry that occurred during crystal growth in Madagascar, and the mixed brilliant faceting has been selected to emphasize those zones through controlled facet angles and pavilion depth. Clarity is graded as very slightly included when evaluated at eye level, with small internal features that do not impede transparency or brightness when set. The sapphire has been heat treated, a stable and widely accepted enhancement, applied to refine color uniformity and to reduce the visibility of minute inclusions while preserving the natural crystal structure. For designers and connoisseurs who evaluate performance, this combination of vivid color, excellent polish, and calibrated proportions makes the gem particularly responsive to both diffuse and directional lighting, producing strong color return with lively scintillation.

When considering mounting and customization, the stone is highly versatile and adapts well to a range of settings engineered to either showcase the bi color effect or to protect and emphasize durability. For maximum color play and light entry, an open back four prong or six prong head holds the pavilion exposed to light while allowing the crown facets to present the bi color split to the viewer. A cathedral or split shank engagement ring design provides elevation and an elegant profile, while a halo of small melee diamonds will amplify perceived size and create a bright contrast that makes the golden tones read warmer. For daily wear applications where protection is paramount, a thin bezel that follows the exact diameter will secure the girdle while softening edge exposure, and an open back bezel can be engineered to maintain pavilion light performance. Metal selection will influence perceived color, with yellow or rose gold tending to warm the appearance and enhance the golden component, and white gold or platinum offering a cooler backdrop that can accentuate any greenish cast. Other options include tension settings for a contemporary floating effect, three stone designs using calibrated side sapphires to create color gradients, and custom cluster or pendant work that can orient the bi color axis to create dynamic shifts as the piece moves.

At The Natural Sapphire Company we routinely translate these technical considerations into bespoke jewelry solutions, offering CAD visualization, hand rendered sketches, and recommendations on facet orientation and setting profiles to maximize the sapphire contribution to a finished piece. For stud earrings or a pendant the six point four five millimeter diameter is excellent as a center for single stone studs or for a solitaire pendant where the depth provides a substantial pavilion presence without appearing bulky. For engagement rings and heirloom pieces we advise secure prong architecture with reinforced shoulders, or a low profile bezel for active lifestyles, and we can coordinate complementary melee or side stones to achieve specific contrast or tone matching. We disclose the heat treatment and Madagascar origin in all documentation, and we can provide mounting guidelines to protect the girdle and maintain polish in regular wear. Please contact The Natural Sapphire Company to discuss custom mounting options, specific metal pairings, and to view CAD mockups that will demonstrate how this particular bi color sapphire will behave when translated from loose gem to finished jewelry.