Signet rings auctions

A signet ring made of silver, hallmarked on the inside with "800." Inner diameter: 20 mm.
585 gold, 10.47 g sardonyx; size 21/22
gold, fineness 0.585, weight 7.99 g carnelian; size 21
0.333 fineness gold, 7.25 g heliotrope; size 20/21
0.800 fine silver, 6.50 g sardonyx; size 16/17