I always use the lovely guy at the Onur Silver shop, on the left as you walk down to the sea......really good honest chap and I have had a few nice bits of jewellery from him that he has done me a good deal on.......
As for the 'dont trust me horrible git' in Fethiye...to be honest I had seen him sooo many times over recent years and everytime I saw him I thought the same ' I really dont like you'...and basically if I really dont like you, there is zilch chance I will enter the shop let alone exchange money....