We can find similar: 1,90 Karat Stern Rubin Cabochon

Natural untreated star ruby (corundum variety) in classic oval caboshon cut without any treatment, original mining - Sri Lanka ref No 10673

colour: red (stpR, colour is described by GIA colored stone grading)

transparency: translucent

stone measurements -  0.236 x 0.196 x 0.196 in / 6.31 х 5.64 х 5.03 mm

ruby weight - 1.90 carats

Comment: no indication of heating

The stone has two Gem reports - EG Laboratories (Sri Lanka) and Gemmological Center of Moscow State University (Russia). 

Lieferung weltweit von Berlin, Deutschland, Moskau, Russland, Paris, Frankreich.