0.43 Ct. Bi Color Sapphire from Thailand

This listing describes one transparent bi color sapphire weighing 0.43 carat, presented in an oval outline with exact dimensions of 5.02 by 4.05 by 2.50 millimeters, executed in a mixed brilliant cut, clarity graded as very very slightly included when evaluated at eye level, color intensity described as intense, polish graded excellent, enhancement reported as no enhancement, and origin Thailand. The stone has a length to width ratio of approximately 1.24, yielding a compact oval profile that favors even light distribution across the table, and a measured depth of 2.50 millimeters which corresponds to a depth of approximately 55.1 percent relative to the average of the dimensions, a proportion that balances internal light return with the preservation of the gem's bi color expression. For buyers who track the precise measurements that govern mounting choices and optical behavior, these figures provide a reliable baseline for bezel or prong engagement and for estimating the perceived spread when set in various head designs.

From a lapidary and light performance perspective the mixed brilliant cut of this sapphire is noteworthy, the crown is faceted to a modified brilliant schema designed to disperse and redirect incident light into the pavilion, while the pavilion utilizes a complementary facet architecture to enhance scintillation and maintain saturation in the bi color phases. The cutting strategy emphasizes asymmetric facet placement at the girdle plane to manage color zoning, each facet junction exhibiting crisp edges and precise symmetry consistent with the excellent polish grade. The girdle has been finished to a thin to medium profile to facilitate secure setting without sacrificing durability, and the culet is minimal to reduce dark windowing in face up view. The clarity behaviour is consistent with the grade very very slightly included, at eye level the stone appears effectively eye clean with only minute needles or pinpoint inclusions confined to lower pavilion facets under controlled examination, inclusions that do not interfere with light path or with the gem's strong pleochroic display.

The bi color character of this sapphire is the primary determinant of its aesthetic and symbolic presence, the stone exhibits two dominant hues that transition smoothly across the table plane, shifting from a deep teal green to a warm yellow green depending on facet orientation and incident light angle. The intense color intensity ensures both hues carry saturation without appearing muddy, and the transparent body allows for crisp color separation at facet junctions which accentuates the duality of tone. Optical phenomena such as pleochroism are apparent, with the stone displaying distinct directional color responses when rotated, a trait that signals natural crystal chemistry and a lack of diffusion surface treatments. Because this sapphire is classified as no enhancement, the color must be appreciated as intrinsic to its material, providing a rare opportunity for collectors and connoisseurs to wear a piece that communicates authenticity. The rich, bold bi color palette serves as a symbol of personal power and distinction, the interplay of cooler and warmer greens creating a dynamic visual vocabulary that reads as both refined and assertive on the jewelry scale.

Practical considerations for designers and clients include the stone weight and size which make this sapphire ideal for a minimalist ring profile, a small solitaire pendant, or as the center of a finely proportioned cluster, the compact oval and strong color will register well even at modest carat weights due to the intense saturation and high polish. Mounting strategies that favor open gallery work will allow light to enter the pavilion and maximize the bi color shift, while a thin bezel can protect the girdle without suppressing the color dynamics, and low profile prongs set to the stone's thin to medium girdle will secure the sapphire while preserving face up area. Provenance from Thailand is an important attribute to mention for specialists who monitor regional growth habits and trace element signatures, and The Natural Sapphire Company stands behind the disclosed origin and the absence of enhancement. For discerning buyers who value technical exactness, optical complexity, and a color that conveys authority and refinement, this 0.43 carat mixed brilliant oval bi color sapphire presents a compact yet powerful choice, and our team at The Natural Sapphire Company is available to provide additional imagery, facet maps, and setting consultation to integrate this stone into a bespoke piece that emphasizes its unique dual tone presence.