(n)rock, stonematerial consisting of the aggregate of minerals like those making up the Earth's crust“that mountain is solid rock”, “stone is abundant in New England and there are many quarries”
(n)gem, gemstone, stonea crystalline rock that can be cut and polished for jewelry“he had the gem set in a ring for his wife”, “she had jewels made of all the rarest stones”
(n)stone, pit, endocarpthe hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed“you should remove the stones from prunes before cooking”