I can't find a mark but it looks to be made of sterling silver?. (see photos for condition details).
Gothic Silver Black Spider Ring Spider Adjustable Ring
BLACK STONE STERLING SILVER SPIDER RING ~NEW, constructed from noble 925 sterling silver;, 925 hallmark stamp sits on the ring’s setting, just below
Sterling Silver Medium Black Spider Ring
Original TAKARA TOMY Gashapon Tarantula Black Widow Redback Spider Animal Anime Action Figure Model Toy Gift Collection Ornament - AliExpress
Green Spider Ring
Sterling Silver Medium Black Spider Ring
Spider Black Widow RING. Pure 925 Sterling Silver Spider Ring. The ring weighs 15.2-15.7 grams depending on size.
Giant Spider Ring 925 Sterling Silver Large Black Widow Spider Black Onyx Gothic
Black spider ring - Gem
Venom Black Ring
Definitely one of the more unique biker ring styles we’ve had! Best of both worlds … spider AND skull! Size 10
Vintage 1986 G&S Sterling Plated Skull Spider Biker Ring
Spooky Spider Ring