It seems doubtful to me that a pebble includes in it the law of gravity in the sense of determining it. The internal structure of the pebble, the reason it stays solid, locations of its atoms in relation to each other, are all due to electromagnetism (and strong/​weak interactions inside the nucleus). Gravity is completely dominated by other forces, to such a degree that it seems plausible to me that an essentially indistinguishable pebble could exist in a universe with a very different gravity law (although in absence of planets it might be more difficult to explain its formation).
It seems doubtful to me that a pebble includes in it the law of gravity in the sense of determining it. The internal structure of the pebble, the reason it stays solid, locations of its atoms in relation to each other, are all due to electromagnetism (and strong/​weak interactions inside the nucleus). Gravity is completely dominated by other forces, to such a degree that it seems plausible to me that an essentially indistinguishable pebble could exist in a universe with a very different gravity law (although in absence of planets it might be more difficult to explain its formation).