0.59 Ct. Bluish Green Sapphire from Ceylon (Sri Lanka)

This 0.59 carat cushion shape bluish green sapphire from Ceylon is a finely balanced gem that combines measured physical proportions with vivid color saturation, and an eye clean clarity. The stone measures 5.65 x 4.26 x 2.73 mm, and features a mixed brilliant cut designed to balance color retention with scintillation. At The Natural Sapphire Company we describe the clarity as very very slightly included when evaluated at eye level, meaning the stone presents as effectively eye clean with only minute internal characteristics that are visible under magnification, and not to the naked eye. The vivid color intensity is a hallmark of quality Ceylon material, sitting between strong green and blue tones to create an attractive bluish green appearance. Enhancement is heat treated, a stable and widely accepted practice for corundum that improves clarity and color in a predictable manner, and the gem displays an excellent polish which enhances facet delineation and light return.

Optically this sapphire exhibits the attributes that distinguish high quality corundum, its refractive index near 1.76 imparts stronger light return than many other gem species, and its subadamantine to adamantine luster gives a bright, crisp sheen to faceted surfaces. The mixed brilliant cut uses a brilliant style crown with a faceted pavilion that maximizes scintillation while preserving depth of color, so the stone flashes lively return of light without sacrificing the saturated bluish green face up. Sapphires also commonly show pleochroism, and this stone will reveal different intensities of blue and green when viewed from different orientations, a feature that adds dynamic visual interest in movement. Compared to gems in the same buying category, such as spinel or tourmaline, this sapphire will generally show a stronger overall brilliance and a more concentrated, velvety saturation because corundum has a higher refractive index and greater hardness. Dispersion in sapphire is modest relative to diamond, so rather than producing pronounced rainbow flashes, the stone gives clean white sparkle and bold flashes of color.

When compared directly to alternative colored stones that buyers often consider, the differences in reflective qualities become instructive. Spinel, with a refractive index around 1.718, can be lively and brilliant, but typically lacks the same depth of color or hardness of sapphire, so it may wear more quickly in everyday jewelry. Tourmaline typically exhibits strong pleochroism and varied hues, but has a lower refractive index and therefore displays less intense light return than sapphire, resulting in a more vitreous appearance rather than an adamantine one. Emeralds, while prized for saturated green tones, tend to be heavily included and have a lower refractive index, so their gleam is softer and less sparkly, and they are more vulnerable to damage without protective settings. For buyers seeking a combination of vivid color, durable day to day wearability, and satisfying light performance, a Ceylon sapphire of this grade presents a compelling balance.

For the educated buyer, this bluish green 0.59 carat cushion sapphire is attractive for several reasons. The Sri Lankan origin is significant, Ceylon has a long history of producing vividly colored sapphires with lively tones and typically good clarity, and heat treatment in this context is both stable and standard in the trade, improving color homogeneity without detracting from value when fully disclosed. The mixed brilliant cut and excellent polish yield a lively play of light while allowing the vivid color to remain the focal point, and the stone’s eye level clarity of very very slightly included ensures strong face up appeal. Given corundum’s Mohs hardness of 9, the sapphire is well suited to everyday jewelry including rings, and the cushion outline provides timeless elegance and a generous face up area for the carat weight. At The Natural Sapphire Company we provide full descriptions and can arrange independent certification on request, and we work with clients to recommend settings that protect the stone while maximizing its reflective qualities, making this sapphire an excellent choice for collectors and connoisseurs who value proven origin, technical quality, and enduring beauty.