Natural Blue Sapphire 0.86 Carat 6x4mm Emerald Cut Rectangle Corundum Faceted Loose Unmounted Gemstone Heat Only

Tested by gemologist: Natural Sapphire (Corundum)
Measurements: 5.9 x 4.0 mm, 3.3 mm deep
Weight: 0.86 carats
Color: Medium Dark Blue
Cut: Emerald cut
Clarity: Type II VVS-VS, Eye Clean
Treatment(s): Heat Only
Condition: Has some very light surface wear (see pictures of gem under magnification, pictures #5-6)
Origin: Unknown