*** PRICED TO SELL AT $30.00 --- RETAILS AT $85.95 *** Mimic nature's creation of beautiful gemstones with the Discovery #MINDBLOWN rock tumbler kit. Just add the stones, rocks, and gritty sand to the tumbler and let it do the rest. Within days you will have smooth, polished gemstones you can use for making accessories. S.T.E.M.-based edutainment.