I can't find a mark but it looks to be made of sterling silver?. (see photos for condition details).
Spooky Spider Ring
Halloween Plastic Black Spider Tiny Joking Toys Decoration Realistic Model - Gags & Practical Jokes - AliExpress
Black Widow Handcrafted Sterling Silver Men's Biker Ring – Clocks and Colours
Black spider ring - Gem
Black Widow Handcrafted Sterling Silver Men's Biker Ring – Clocks and Colours
Mens Spider Ring
Top-qualität Retro Monster Gothic Ring Schmuck Spider Muster Ringe Schmuck Mode Persönlichkeit Stereoskopischen Ring Schmuck - AliExpress
Spider Ring Men
Top-qualität Retro Monster Gothic Ring Schmuck Spider Muster Ringe Schmuck Mode Persönlichkeit Stereoskopischen Ring Schmuck - AliExpress
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
Black spider ring - Gem
VINTAGE BLACK WIDOW SPIDER ENAMEL BIKERS RING STERLING SILVER?