A 24.21-carat yellow sapphire with characteristics similar to those found in Madagascar-origin sapphires

The micrograph reveals a yellow sapphire (24.21 carats) with physicochemical characteristics similar to those of yellow sapphires from Madagascar. 

Two black prismatic inclusions have been identified as uranothorianites, and a small cluster of colourless zircons is also visible above the uranothorianite on the right. 

The smooth, iridescent appearance of the fissures suggests that the gem has not been heat-treated. 

This yellow sapphire also exhibits a slight photochromism and is the subject of a Gem Note soon to be published in the Journal of Gemmology.
 

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