Grum's Gold Exchange is located in Port Sarim. The store sells many kinds of unenchanted jewellery, though it does not deal in dragonstone or onyx jewellery or bracelets. It is the only jewellery store in RuneScape and one of the only stores that has an automatically closing door.
Grum's Gold Exchange does not stock items. Any items sold by the shop were sold to it by other players. This makes the shop useful for getting rid of unwanted jewellery, as it will buy them for a higher price than other shops.
Beware, as if you are trying to sell jewellery at a large quantity the price per piece will decrease rapidly. Items that are sold to Grum's Gold Exchange go through a 10 minute stock removal cycle. This means that when an item is sold to the store, one stock will get removed after 10 minutes.