An extremely rare colour-change gemstone from Bekily, Madagascar.
This highly sought-after Garnet variety, a member of the Pyrope-Spessartine series, has a remarkable colour-change effect, turning from blue in daylight to a vivid violet-red in incandescent illumination (image 2).
The stone has a few visible inclusions, the rod-like growth features which are characteristic of the gems from this locale (see magnified image 5).
Unlike the gem on offer here, very few stones with a genuine blue colour are found, most exhibiting a greenish-blue colour in daylight.
To see a short video of the startling colour change effect on YouTube, please use this link:
weight: 1.18 carats
shape: Mixed oval cut
dimensions: 7.50 x 5.49 x 3.40 mm