What size are the stone dice? – These dice are 16mm-18mm whenever not mentioned. Please note that due to the nature of hand cutting the semi-precious stone dice, that they will not always be the exact size.
If I roll my semi-precious dice, will they crack/break? – It all depends on the surface you are rolling them on. If you roll them on a hard surface such as wood or concrete, they will break. If you roll them on a softer surface like leather or velvet, then your dice should last you a long time.