Several options; one of them is southwest of Varrock. That one is fairly near to the bank.
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To get soft clay within Runescape you must first mine a clay rock, located in many mines throughout Runescape, once you have some clay you must get a bucket and fill it with water and use it on the clay.
In barbarian village
Clay goes for 177Gp each Soft-Clay goes for 244GP each
Mine some clay, pour water(bucket) on it, and then use a chisel on the soft clay.
Click use on the ring and use the clay ring on the priest