what's pebble
(December 2013) A pebble is a clast of rock with a particle size of 2 to 64 millimetres based on the Krumbein phi scale of sedimentology. Pebbles are generally considered larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). A rock made predominantly of pebbles is termed a conglomerate.
Pebble refers to the grain/texture,on the surface of the leather. It is not necessarily better or worse than any other leather finish, it's just a different look. What makes a leather more expensive/desirable is the type of skin the leather is and how the texture/grain came about on the skin.