How do you release a sink drain that have small stones cause the problem...is within anything that will work? ...
Answers: you will have to verbs the P-trap off and verbs it out
get a wrench or rut locks and undo the two compression nuts on the "u' shaped trap below the sink
there will be two rubber or plastic o-rings that the compression nuts squeeze together to form a hose tight seal
after you enjoy cleaned/washed the trap out, reassemble
if it leaks, try slightly tightening the nuts, if it still leak you may have to buy hot 1 1/4" compression gaskets for a sink drain at your local home improvement store
small stones? how do you know this for a reality the only piece that will break them loose is a snake you can rent them at most home improvement stores