0.91 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This 0.91 carat Ceylon blue sapphire began its story deep within the high grade metamorphic belts of Sri Lanka, where aluminum and silica rich protoliths were subjected to prolonged heat and pressure over millions of years. Within those dynamic conditions corundum nucleated as aluminum oxide crystals, and trace amounts of iron and titanium established the blue chromophore, while minor inclusions were trapped as the crystal grew. Subsequent tectonic uplift and weathering liberated crystals into alluvial gravels, where natural tumbling smoothed faces prior to human recovery. Heat treatment performed under controlled conditions enhanced the internal diffusion of titanium and homogenized color zoning without altering the crystal lattice, stabilizing the vivid color intensity that collectors value, while preserving natural inclusions that attest to the gem provenance and formation history.

As presented by The Natural Sapphire Company, this oval shape sapphire measures 6.42 by 4.88 by 3.60 millimeters, with a mixed brilliant cut that combines a finely faceted crown with a precision pavilion to optimize return of light and internal scintillation. The cutter achieved an approximate depth proportion of 64 percent, a balanced geometry that supports both saturation of the vivid blue and efficient light performance. Clarity is graded as very very slightly included when evaluated at eye level, with inclusions that do not interfere with transparency or brilliance, and the polish is excellent, delivering crisp facet junctions and clean window free surfaces. The gem displays strong pleochroism between slightly different blue tones when rotated under directional light, and the mixed brilliant faceting pattern produces alternating flashes of sapphire blue and deeper velvety blue, indicative of precise facet alignment and competent lapidary technique. For connoisseurs seeking a compact, museum quality Ceylon stone with natural origin, documented enhancement, and measurable cutting proportions, this sapphire represents a technically refined example of Sri Lankan gem craftsmanship, and our specialists are available to provide further spectroscopic and inclusion imaging data upon request.