18.59 Ct. Green Sapphire from Ceylon (Sri Lanka)

This exceptional transparent 18.59 carat oval green sapphire measures 17.35 x 13.25 x 9.27 mm and has been precision cut to a mixed brilliant profile that balances scintillation and color saturation. The mixed brilliant faceting combines a brilliant style crown with a carefully calibrated pavilion, producing strong face up brilliance while retaining weight. The clarity grade is very very slightly included evaluated at eye level, which in practice allows a generous crown table and broad facets to reveal the stone's internal depth without visible distraction. Medium color intensity yields a rich, forest to teal green that responds subtly to viewing angle because of pleochroic behavior common in sapphires from Ceylon Sri Lanka, the documented origin of this material. Heat treatment has been applied using standard trade protocols to stabilize and even the tone, and an excellent polish and precise facet junctions ensure minimal light leakage and crisp facet reflections when set.

For customization The Natural Sapphire Company can translate this oval into a variety of elegant and technical settings that take full advantage of its scale and optical properties. The stone dimensions and 9.27 mm depth make it ideal for classic solitaire prong mounts that permit maximum light entry through the pavilion, or for a halo configuration where small melee accent stones enhance perceived size and contrast. A bezel setting provides security and protects the girdle for high wear pieces such as daily rings or signet style mounts, while an east west orientation emphasizes the oval silhouette for modern rings and cufflinks. Metal selection is an important design parameter, platinum or 18 carat white gold will increase perceived brilliance, yellow gold will warm the green, and rose gold delivers a vintage aesthetic. Because the mixed brilliant cut was executed to optimize light return, The Natural Sapphire Company can also offer custom recutting or reorientation to tailor length to width ratio and pavilion angles for specific bespoke settings, with careful consultation about weight retention and optical tradeoffs. For large statement rings, pendants, and bespoke high jewelry pieces our gemmological team can provide CAD visualizations, mounting engineering, and secure setting construction to ensure the sapphire performs visually and structurally for generations.