Ring #1 (left to right)? is glass in a crusty junk ring (probably lost years ago).
Ring #2 is 10k, engraved w/ initials and a date.
Ring #3 is anodized aluminum (typical of India, though this one isn't stamped).
Ring #4 is apparently silver, but the hallmark is confusing and the tarnish doesn't clean easily.? This is probably less pure than sterling.? The design consists of 3 cutouts, a horse and two longhorns.
Ring #5 is DIAMONDS, small but genuine, 25 of them!? Alas, the gold is only 10k...
Ring #6 is typical of a gumball machine style.