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

This transparent 1.85 carat round bi color parti sapphire measures 6.85 x 6.84 x 4.95 mm and is finished in a faceted mixed brilliant cut. The corundum crystal structure of sapphire is trigonal and optically dense, with a refractive index that promotes strong internal reflection. In this example the combination of medium color intensity and transparent body allows light to penetrate deeply before being redirected by the pavilion facets, producing sustained return of white light and distinct scintillation. The mixed brilliant design, with a brilliant facet arrangement on the crown and a complementary pavilion geometry, creates multiple layers of reflected light. Each facet plane acts as a controlled mirror, so the precision of facet junctions and symmetry are critical to delivering contrast and lively flashes of brightness as the gem is moved. The near perfect round proportions evident in the 6.85 by 6.84 millimeter measurements support uniform light performance across the table and crown, and the excellent polish minimizes surface scattering so that light is reflected cleanly from facet to facet.

Clarity described as very slightly included at eye level means inclusions are minimal and do not interrupt the pathways by which light is channeled through the stone. Those clear pathways, together with the bi color parti character, produce a dynamic visual effect that alternates between zones of cooler and paler tones depending on viewing angle and lighting. Sapphire pleochroism in corundum further enhances this effect by allowing different wavelengths to be emphasized along different crystallographic orientations. Because this stone is untreated, no diffusion or heat alteration has modified its natural optical parameters, so the sparkle arises solely from its inherent material properties, cut, and finish. Origin documented as Ceylon Sri Lanka speaks to a geological source known for producing sapphires with fine crystalline qualities. The Natural Sapphire Company presents this gem with specification driven information to support evaluation by gemologists and discerning purchasers who prioritize structural and optical integrity.