gold and amethyst snake ring

An 18 carat gold Victorian ring set with a deep purple amethyst with a buff top cut (the top is domed with a cabochon cut, while below the girdle, the gem has facets on its pavilion), decorated with two intertwined snakes all around the shank, signed: George O. Street & Sons, New York, (1837-1950), circa 1900.

weight: 5.9 grams
Ring size: 14.75 mm. 3 3/4 US.