gold snake ring with diamonds

An 18 carat yellow gold snake ring set with diamonds, descending in size, the largest one in the head, smaller ones in the tail. Two tiny ones as eyes on the sides (app. 1.2 carat in total), with a French aigle and master mark, France, circa 1900.

weight: 4.4 grams
size: 17-mm/16.75+ mm / 6 1/2 US
width: 2.8 – 9.5 mm