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

This 1.73 carat emerald cut bi color parti sapphire from Ceylon, Sri Lanka presents a combination of precise geometry and vivid hue that makes it ideal for custom jewelry, The Natural Sapphire Company. The stone measures 6.64 x 5.68 x 4.73 mm, with a depth of 4.73 mm which corresponds to a depth proportion of approximately 77 percent relative to the average of the length and width. The faceted cutting style employs a classical step cut on the crown and pavilion, generating broad, linear facet planes that emphasize the stone's color zoning and parti nature. The emerald cut architecture, with truncated corners and parallel facets, yields controlled light return and a series of broad flashes rather than dispersed scintillation, a quality that is particularly advantageous for designers who wish to orient the bi color effect within a mounting. Clarity has been graded eye clean at eye level, ensuring that the step facets read with minimal distraction, and the excellent polish enhances facet contrast and surface brightness. Heat treatment has been applied to stabilize and intensify the hue, resulting in a vivid color intensity that displays distinct color separation across the table when rotated under directional light.

From a setting and design perspective this sapphire's dimensions and shape make it highly adaptable for bespoke pieces, The Natural Sapphire Company. The rectangular footprint and near 6.5 by 5.7 millimeter spread provide sufficient face up area for a single stone solitaire ring while remaining proportional for pendants or asymmetric three stone layouts. The combination of eye clean clarity and step faceting supports open prong and bezel designs, with four corner prongs recommended to protect the corners while allowing the step facets to interact with incoming light. For designers seeking to exploit the parti coloration, orienting the crown axis parallel to the finger or pendant bail will maintain the bi color transition in predictable fashion, and a low profile setting will preserve the stone depth to optimize visual proportions. Technical buyers will appreciate the stable cutting geometry, consistent facet symmetry, and excellent polish, all of which reduce setting rework and enable precise metal work, making this emerald cut bi color sapphire a practical and refined choice for custom, high quality jewelry.