Lot Of 4 925 Sterling Silver Gold Tone Rings

Lot of 4 gold tone sterling silver rings. The first one has a large black possible dark brown stone and is marked 925 and a size 7. The second is a gold toned band also marked 925 and is a size 6.5. The third is a very pretty clear stone cluster ring that is a size 6.5. All are in very good condition. The March birthstone ring is marked but I can’t make it out and the band has some flaking. Size 8.5.