Antique collectible ring

I am selling my old ring with an aura from the Russian Empire era, it has a hallmark, but it's not visible, so it was tested at the hallmark board. The stone is artificially created corundum, changing its hue. Reasonable signs of use are possible. Size ~20/60. 9½, S. ~1.92 g. Box is not included in the price. Insured shipping within LV is included in the price.