Hey all i decided to open up 100 stone chests
To find where the chest is located you need to teleport into the ::hydra area and run south and over the wall, you will require 90 slayer to get over this wall.
Once over the wall you will see 3 chests in the corner to the east and it is the one closest to the wall you just jumper over
To open this chest you will require a Stone Key (old key) that is dropped from killing the hydra monster the drop rate is a 1/15
Click Here to find a guide to kill Hydra
Here is what I got from opening 100 Chests
If you are a donator there is a chance that you will not use the key when you open the chest, depending on you donor rank.
Hope this helps with finding out what you can get from the stone chest in the future.
Turkey