Authenticity 100% guaranteed
Super rare example of antique russian glass.
Stunning cobalt blue color, ten-sided beaker - goblet - cup.
Hand cut and hand decorated with gold.
Unmarked.
Height:  just under 6 in. Tall - 15.2 cm.
Very heavy -  about 514 grams. 
Excellent original antique condition with minimum amount of normal wear. No chips or cracks. No repairs. 
For a similar gilded blue glass vase, see, valentina golod, decorative objects from st. Petersburg private collections, moscow, 1995, page 77.