1.59 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 1.59 carat round blue sapphire is a textbook example of measured craftsmanship and natural beauty from Ceylon Sri Lanka, offered by The Natural Sapphire Company. The stone measures 6.73 x 6.75 x 4.39 mm, and the proportions were preserved intentionally to balance face up color saturation with optimal light return. The mixed brilliant cut combines a modified brilliant crown and a more controlled pavilion architecture, producing pleasing scintillation without sacrificing color depth. The sapphire is transparent, with a clarity grade described as very slightly included when evaluated at eye level, which means minimal internal features are present, and they do not materially interfere with the stone optical performance. The color intensity is dark, producing a deep velvety blue that remains lively thanks to precise facet alignment and an excellent polish.

From a cutting and craftsmanship perspective, the mixed brilliant style on this round stone is executed to emphasize both color and brilliance. The crown comprises a series of kite and star facets arranged to form a pavilion centric light engine, while the pavilion features broader facets that act to concentrate and return light into the crown field. This arrangement moderates windowing and reduces contrast loss that can occur in deeper stones, preserving a rich face up color even under diffuse light. The girdle and pavilion apex were finished to maintain strong symmetry, which enhances even facet distribution across the table, and the excellent polish ensures that facet junctions remain crisp, aiding in strong specular reflections and clean scintillation. The result is a round sapphire that reads as uniformly saturated, yet alive with facet driven flashes when the gem is moved.

Under different lighting conditions this sapphire shows predictable and desirable optical behavior for a dark intensity Ceylon material. In natural daylight, particularly northern or diffused daylight, the stone displays its truest face up blue, a deep but vivid tone with subtle violet undertones that are characteristic of Sri Lankan blue sapphires. Direct sunlight increases contrast and reveals sharp flashes of lighter blue from the crown facet facets, creating lively scintillation without washing out the core color. Under incandescent light the stone will appear warmer, with the darkest zones becoming richer, and a gentle shift toward slightly deeper blue, while still maintaining a clear, saturated appearance. Under modern cool white LED or fluorescent sources the stone can show stronger blue saturation and increased apparent sparkle across the table due to the spectral composition of these lights, which favor the shorter blue wavelengths. In low light and candlelight the dark intensity emphasizes depth, producing a near velour appearance, with small pinpoint flashes where facet faces catch the light, offering an elegant evening presence.

Practical considerations for use and setting are influenced by the gem proportions and natural state. Because this sapphire is untreated, the color is intrinsic and will respond consistently to polishing and setting style. An open gallery in a bezel or prong setting will allow light to enter the pavilion and maximize internal light return, enhancing both brilliance and apparent color saturation. White metals such as platinum or white gold will emphasize brilliance and the cooler aspects of the blue, whereas warmer metals will bring forward slightly richer character in the tone. The very slightly included clarity grade means the stone will photograph and face up exceptionally well for use as a center stone in rings, pendants, or classic solitaires, without needing treatment to mask inclusions. As with any fine natural sapphire, routine care involves avoiding high heat exposure and harsh chemical cleaners, using mild detergent and warm water with a soft brush for cleaning, and periodic inspection of the mounting. The provenance from Ceylon Sri Lanka, the absence of enhancement, the mixed brilliant cut, and the meticulous polish are all aspects that we at The Natural Sapphire Company highlight for discerning buyers seeking a naturally fine sapphire with measurable optical performance.