"Is there any difference between rock and stone?" A rock is a hard mineral matter that makes up parts of the earth's crust. Rocks are actually made of stones,which is a hard compact nonmetalilc material. A 'stone' could be a small piece of rock,but designated and cut in a certain shape for a particular purpose. P.S Some use them as synonyms. It depends also in which English speaking country.

The best way to remember is a rock is a giant eg Rock of Gibraltar, A stone is a small rock, a pebble is a tiny stone a gravel is a piece of "useless" pebble - good enough to be used on a driveway or a garden path. All these words can be slang for jewels indicating their relative sizes...Elizabeth Taylor's diamonds are rocks compared to my pebbles. And of course telling a lady that her diamond ring is gravel is down right an insult!

I suppose it depends on where you are from. I have often heard Americans speak of a 'rock' to refer to those small objects that the British and Australians call 'stones'. Confusingly, when these same stones are located on a beach, they then become pebbles! On a driveway, they become gravel.To the British and Australians, rocks are considerably larger than stones and the word often refers to those large pieces of stone found in the vicinity of cliffs, caves and mountains, whereas stones are more 'pebble' sized. I don't think that there is a definite point where, in relation to size, stones stop being stones and become rocks.