5.08 Ct. Color Change Sapphire from Ceylon (Sri Lanka)

This transparent 5.08 carat asscher octagon color change sapphire measures 9.57 x 9.03 x 5.44 mm, and is cut in a classical asscher step style with trimmed corners and broad, concentric step facets that emphasize plane surfaces and color saturation. The proportions yield a depth of approximately 58.5 percent, a geometry that promotes strong color concentration and a weighty face up for its carat size. Clarity is graded very very slightly included as evaluated at eye level, meaning the stone is effectively eye clean and maintains high transparency through the large table. The cut shows crisp facet junctions and an excellent polish, attributes that enhance the stones hall of mirrors effect and permit a distinct color change response. Origin is Ceylon Sri Lanka, enhancement is disclosed heat treatment, and the asscher architecture makes the color transitions readily observable under different lighting conditions, with a distinctly greenish teal or blue green appearance under fluorescent or daylight illumination, and a pronounced shift to violet to bluish purple under incandescent light.

Compared to classic Kashmir sapphires, which are typically medium tone cornflower blue with a velvety silk and even diffusion, this Ceylon color change is noticeably darker and more pleochroic, offering a stronger two tone personality rather than Kashmirs single velvety blue. Versus Burmese sapphires, known for their deep, saturated royal blue with glassy brightness, this stone exhibits more complex hue dynamics by moving into purple fields under warm light rather than simply deepening in blue. Australian sapphires often present very dark inky blue green tones similar in tone to this gem, however Australian material rarely displays the clear purple shift seen here. Montana sapphires tend to be lighter and more pastel teal or green blue with subtler change, while Madagascar material can approach Ceylons daylight brightness but typically lacks the same dark intensity and dramatic purple under incandescent light. At The Natural Sapphire Company we present this piece as a specialist collectors stone and a striking center for a geometric setting, the asscher cut and excellent polish making it ideal for designs that showcase color change rather than scintillation, and with full disclosure of heat treatment and Ceylon origin for informed purchasing.