1.59 Ct. Blue Sapphire from Ceylon (Sri Lanka)

One beautiful transparent 1.59 carat cushion shape blue sapphire, with dimensions of 8.06 by 6.18 by 3.49 millimeters, is presented from our current inventory. This gem is faceted in a mixed brilliant cut which combines the lively scintillation of brilliant facets with the color enhancing planes of a step profile, producing a balanced interplay of sparkle and color depth. The clarity is graded as very slightly included when evaluated at eye level, which means the stone exhibits only minor internal characteristics that do not interfere with visual appreciation or structural integrity. The color is described as intense in saturation and tone, offering a rich and vivid blue that reads strongly even in modest lighting. The polish is excellent, giving the pavilion and crown facets highly reflective surfaces that maximize light return. Enhancement is disclosed as heat treated, a stable and widely accepted practice used to optimize color and clarity in natural sapphires. The origin is Ceylon Sri Lanka, a source long associated with some of the most collectible and historically significant blue sapphires, and this provenance is an important factor in how connoisseurs assess the piece.

When comparing brilliance and visual behavior to more common gemstones, this sapphire has a distinct optical profile that sets it apart. Diamonds possess the highest refractive index among common gem materials and therefore exhibit exceptional fire and brilliance. Corundum, the mineral family that includes sapphire, has a refractive index in the range of approximately 1.76 to 1.78, lower than diamond, but this does not diminish its appeal, it changes the character of the light interaction. Instead of relying on intense dispersion or fire, a high quality blue sapphire offers luminous body color, strong color zoning control, and pleochroism which produces subtle shifts in tone and intensity when the stone is viewed from different angles. Compared with gemstones like blue topaz or aquamarine, which are typically lighter and show more watery brilliance, this Ceylon sapphire displays a concentrated, saturated blue that projects through the gem rather than merely reflecting it. Compared with tanzanite, which is known for its velvety violet blue and relative softness, this sapphire delivers similar visual depth while offering superior hardness and durability for everyday wear. The mixed brilliant cushion cut in this piece accentuates large flashes of vibrant blue interspersed with smaller scintillations, so the gem reads as both lively and deeply colored, a combination that educated buyers recognize as rare among mid sized blue stones.

Clarity and cutting quality are central to the gemological evaluation and to investment grade desirability, and this sapphire performs well on both counts. Very slightly included at eye level indicates that trained observers will note only limited natural inclusions under routine examination, and that the stone presents as clean and transparent in person. These inclusions are intrinsic markers of natural origin, and in sapphires they commonly take the form of minute crystals or linear features that do not compromise toughness. Corundum rates a 9 on the Mohs hardness scale, exceeded only by diamond, which means this sapphire is exceptionally resistant to abrasion and suitable for rings and high wear settings where durability is prized. The excellent polish reported for this gem ensures that light is reflected efficiently from facet planes, enhancing perceived brightness and richness. The choice of a mixed brilliant cutting style further optimizes face up appearance by balancing the size of the table, crown angles, and pavilion geometry to produce both strong color saturation and effective return of light, a combination that often yields higher perceived value than stones whose cutters prioritized weight retention over optical performance.

Provenance, treatment disclosure, and physical measurements are critical elements an informed buyer will evaluate, and this sapphire offers a compelling profile across those criteria. Ceylon Sri Lanka has produced many of the benchmark blues that define collector and luxury markets, and stones from this region are frequently prized for their lively, medium to strong saturation blues. Heat treatment is an industry standard for improving the color and clarity of corundum, and when disclosed it allows buyers to assess value with transparency. The weight of 1.59 carats and the cushion shape of 8.06 by 6.18 by 3.49 millimeters make this piece a versatile candidate for a variety of mountings, from classic four prong solitaire settings that emphasize the gem as a centerpiece, to halo or split shank designs that add perceived size while maintaining the integrity of the stone. For the educated buyer, the combination of intense color intensity, eye level very slightly included clarity, mixed brilliant cutting, and excellent polish creates a balanced gem that performs beautifully in both daily wear and in more formal presentation. The Natural Sapphire Company stands behind the origin and treatment disclosures for this stone, and we offer personalized consultations regarding custom mounting options, independent gemological reports, and aftercare recommendations to ensure long term satisfaction. This sapphire represents an investment in a natural, highly wearable blue with strong aesthetic and gemological credentials, and it will appeal to buyers who seek the depth of color and enduring durability that distinguish top quality Ceylon sapphires.