0.51 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.51 carat round Ceylon blue sapphire from The Natural Sapphire Company is a compact but striking example of classic Sri Lankan material, measuring 5.00 by 4.91 by 2.90 millimeters with a mixed brilliant cut, intense color intensity, excellent polish, and a clarity grade of very slightly included as evaluated at eye level, enhancement by heat treatment. The transparent body color displays a vivid medium to deep blue that is evenly saturated across the table, and the mixed brilliant faceting provides a balance of broad color and lively facet driven sparkle. For an educated buyer, the combination of intense saturated hue, high transparency, and excellent polish places this gem in a desirable quality tier, especially given its origin in Ceylon Sri Lanka where sapphires are known for vivid, velvety blues.

From a grading perspective the very slightly included clarity assessment indicates small natural features that are visible only with careful observation at normal viewing distances and do not compromise stability or durability, nor do they significantly impede light return. Heat treatment is standard practice for Sri Lankan sapphires and is an accepted enhancement that improves color uniformity without detracting from the gemological integrity, and noting origin adds provenance value because Ceylon material often commands collector interest for its characteristic tone and hue. The mixed brilliant cut optimizes both color and scintillation, so the pavilion and crown geometry work together to return light efficiently, while the excellent polish ensures minimal surface disturbance to luster and life.

Under different lighting conditions this sapphire will show lively performance, in bright daylight it will present its truest intense blue with broad, even color across the table, and the mixed brilliant facets will create strong white sparkle and scintillation. In direct sunlight the stone will show increased brilliance and a lively mix of bright flashes and deeper blue flashes as the angle changes, enhancing perceived saturation and making the color appear richer. Under warm incandescent light or candlelight the sapphire will take on a slightly warmer, more velvety blue tone with reduced contrast between bright flashes and the body color, creating an elegant, classic look. Under modern cool LED lighting the stone will exhibit crisp, bright scintillation and a slightly cooler blue tone, highlighting facet contrast. For mounting, an open setting that allows light to enter through the pavilion will maximize brightness, and as a small, intensely colored gem it will provide strong visual impact relative to its size.