Description
Blue sapphire has long held a privileged place in the canon of precious stones, prized by collectors and connoisseurs for the extraordinary depth and purity of its colour. This 0.85 carat specimen represents a particularly wearable and versatile weight — substantial enough to command presence in a fine setting, yet refined in its proportions. Corundum of this quality rewards close examination, revealing the interplay of hue, tone, and saturation that separates a truly considered stone from the merely decorative.
| Name |
Blue Sapphire 0.85 cts |
Frequently Asked Questions
What gives blue sapphire its characteristic colour, and how is quality assessed?
Blue sapphire derives its colour from trace amounts of iron and titanium within the corundum crystal structure, with the finest examples displaying a vivid, medium-to-medium-dark blue with strong saturation and minimal grey or green modifiers. Gemologists evaluate colour across three dimensions — hue, tone, and saturation — with the most sought-after stones described as a pure, slightly violet-leaning blue at a tone of roughly 75–85%. Provenance can also influence colour character, as sapphires from Kashmir, Burma, and Ceylon each carry subtly distinct optical signatures familiar to experienced collectors.
Does this sapphire display any optical phenomena such as asterism or colour change?
This is a transparent, faceted blue sapphire and does not exhibit asterism, which requires a cabochon cut and a precise rutile needle inclusion pattern to produce the star effect. Colour-change sapphires, which shift between blue and violet or purple under different light sources, are a separate and rarer category of corundum entirely. The optical character here is evaluated through its brilliance and extinction patterns under standard gemological lighting conditions.
Has this sapphire been treated, and why does treatment disclosure matter to collectors?
The vast majority of blue sapphires in the market have undergone heat treatment, a widely accepted process that clarifies and intensifies colour by dissolving silk inclusions and improving transparency. Disclosure is critical because untreated sapphires of fine colour command a meaningful premium — often multiples of the treated equivalent at comparable carat weight and quality. A credible laboratory report from an institution such as GIA, Gübelin, or SSEF will confirm treatment status and, where applicable, provide an assessment of geographic origin.
How should a blue sapphire of this type be cared for, and does it hold long-term value?
Sapphire ranks 9 on the Mohs scale, making it exceptionally resistant to scratching and well suited for daily wear in rings, pendants, and bracelets without the same fragility concerns associated with softer stones. Cleaning with warm soapy water and a soft brush is safe and effective; ultrasonic cleaning is generally acceptable for untreated stones but should be approached cautiously with fracture-filled or heavily included specimens. From an investment perspective, fine quality blue sapphire at sub-carat weights in commercially desirable sizes has demonstrated consistent demand, particularly as collector interest in certified, natural corundum continues to grow in established and emerging luxury markets.
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