I think I've been very lucky in finding a good one (recommended by a friend)
While I was in there I told her about a bangle that I have but haven't worn more than once in the past three years. She said she was happy to have a look at it, with no obligation. She also said that if it was very re-sellable, she would give ma a different price than the scrap price she had just paid me. I was very impressed by her professionalism, I had got a previous quote across the road before I went to her.
She weighed all the scrap stuff in front of me (the other place took it "out the back") then just as she was about to say a price she took one ring off and weighed it separately as it was 22 carat, and worth more.
On Saturday some friends in the trade popped round and I showed them the bangle, gold, with a safety chain and shaped like bamboo. They reckoned about £30.
I went to the same shop again and without even weighing it (she did look at the hallmarks and new she could re-sell it rather then scrapping) offered me £90! I was pretty chuffed!
Sorry flower this isn't helping your stuck ring, is it? 