A blue Sapphire gemstone from Sri Lanka.
The colour of this gem is described in the trade as "top Ceylon", a saturated medium-blue shade (slightly paler than my images show).
The gem has received market-standard heat treatment, is well cut and has no eye-visible inclusions.
weight: 0.80 carat
shape: Emerald cut
dimensions: 6.03 x 4.22 x 3.24 mm
treatment: Heat treated