1.89 Ct. Purple Sapphire from Ceylon (Sri Lanka)

This 1.89 carat cushion shaped purple sapphire is a noteworthy example of fine Ceylon corundum offered by The Natural Sapphire Company. The stone measures 7.11 by 6.99 by 4.36 mm, and it is fashioned with a mixed brilliant cut that combines the depth and table proportions of a traditional cushion with a modern faceting scheme designed to maximize light performance. The material is transparent, with an intense color intensity that presents a saturated, vivid purple across the crown. At eye level the sapphire is graded eye clean, indicating that no inclusions are visible to the unaided eye under normal viewing conditions, and the polish is evaluated as excellent, with crisp facet junctions and smooth reflective planes. The sapphire is unenhanced, and the origin is Ceylon, Sri Lanka, a source historically associated with well colored and evenly saturated sapphires.

Optically, the combination of a mixed brilliant cut and a cushion outline creates a balanced presentation of color and sparkle. The mixed brilliant faceting concentrates light return through multiple internal reflections in the pavilion, while the rounded cushion outline softens the pattern of light and helps maintain color saturation across the table. Because the stone is eye clean, light pathways are largely unobstructed, allowing for consistent internal scintillation without distracting inclusions. The excellent polish enhances surface reflectivity, so facet planes act as strong mirrors for incident light, producing clear flashes and a crisp contrast between bright and dark areas. In practical viewing conditions the sapphire displays both lively pinpoint scintillation at closer inspection, and broad, saturated flashes of purple at normal viewing distances, a balance that is often sought for colored center stones.

When compared to other gemstones in the same category, this purple Ceylon sapphire exhibits distinct reflective characteristics rooted in corundum's optical constants. Sapphires have a refractive index in the range of approximately 1.76 to 1.77, and a modest dispersion around 0.018, which yields strong light return and a bright, adamantine to vitreous luster, while producing relatively restrained spectral fire compared with higher dispersion gems. Against spinel, which typically has a slightly lower refractive index around 1.72 and similar dispersion, this sapphire will tend to show a marginally higher brilliance and a firmer contrast between light and dark facets, while spinel often appears a touch more glassy. Versus tanzanite, which has a lower refractive index near 1.69 to 1.70 and pronounced pleochroism, the Ceylon sapphire presents more persistent brilliance and less directionality in color, whereas tanzanite can shift markedly in hue with different viewing angles. Compared to quartz varieties such as amethyst, with a refractive index near 1.54 and lower dispersion, the sapphire returns light with greater intensity and delivers a more vivid ocular presence, since quartz reflects less light and therefore appears more subdued in equivalent sizes. For reference, diamonds have substantially higher refractive index and dispersion, which creates much greater fire, however diamonds are outside the corundum category and their optical profile is not typical for colored stones that prioritize saturated hue.

From a setting and use perspective, the attributes of this sapphire inform practical decisions for jewelry design and long term wear. The cushion outline and mixed brilliant faceting favor settings that allow light to enter the crown and to circulate through the pavilion, so open or minimally obstructive mountings will maximize perceived brilliance and color depth. The intense natural purple color and the stone being unenhanced support designs that emphasize the material itself rather than relying on contrast stones to deliver presence. The eye clean clarity and excellent polish reduce the need for protective bezeling solely for aesthetic reasons, although practical considerations such as metal hardness and daily wear should guide the final mounting choice. The Natural Sapphire Company provides documentation of origin and enhancement status for this sapphire, and technical details on cut proportions and face up appearance can be provided to assist with design planning or gemological review. For clients seeking a transparent, vividly colored cushion sapphire with strong light return and natural Ceylon provenance, this example offers an instructive combination of optical performance and gemological integrity.