I have got a stone of about 8 mm in Gall bladder, how can it be removed without operation. So far I have no problems with it.

Gallstone options. Actually, the best and most reliable method to treat gallstone disease as a result of the imbalance of bile salts, bike acids, and cholesterol, is to remove the gallbladder surgically, usually by laparoscopy. There are other non-operative treatments like taking ursodeoxycholic acid, lithotripsy, and endoscopic therapies, but the success rates are lesser and the stones usually recur.