The things you place in the tumbler specifically to shine the rocks in the ultimate stage is generally made of cerium oxide, tin oxide, chrome oxide, or aluminum oxide. It's a type of grit usually called a polishing compound and is extremely good. I've previously obtained two.5kg of the grit https://www.facebook.com/permalink.php?story_fbid=pfbid02gq56fTkmkwC2pgrf5dXqEHjjkeVq47Kz7HbfGUJB5NuyEbqhLQ3QbVSiCewC1NeRl&id=61562415773754&__cft__[0]=AZUKPOCFUxIi8TSZ1h7Iy8A44KKPsLNsHGcPSl1GX99o4ryUgNkUQYow5Zoi2v1Kq8-5Bf8DL7BlzXIrEet-0xiSE8FZ2u2BwC563M4DYb_p4cJ6W2mf0yH78Nsek2OMXmVIfSSZp512oUH9tPjCwhAb2ScRXkRSmsem9BCcBKCliLvG3HCTcXhDLKQ5kGl3XF5w4qrv0nlMcv2IErD-B8Qq&__tn__=%2CO%2CP-R