rock, stone - material 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" --2is a kind ofmaterial, stuff --2has substances: mineral --2has particulars:
gem, gemstone, stone - a 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" --4is a kind ofcrystal --4is a part of jewelry, jewellery --4has particulars: cabochon; opaque gem; transparent gem
stone, pit, endocarp - the 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" --5is a kind ofpericarp, seed vessel --5has particulars: peach pit; cherry stone