Any item marked Silver is either:-
Sterling silver which is 925 parts fine silver and 75 parts copper
Argentium which is 935 parts silver and the rest is a mixture of Germanium and copper. This has a much higher resistance to tarnishing than Sterling silver.
Items under 7.78g do not legally need to be hallmarked but many of my pieces are.
Many of my pieces have decorations in Gold, either 9ct, 14ct, 18ct or even 22ct. Details on individual pieces.
Contemporary Jewellery in Silver, Gold and Titanium by Sylvia Tomkinson