Lillian Rose Natural Signing Stones Color is Natural Color of the Stones, Color is Not Uniform Imported These natural signing stones are a unique alternative to the traditional guest book. There are approximately 15-20 stones for signing Signing pen is not included -- a permanent fine or medium point marking pen is recommended. Display stones by the vase. Guests may pick a stone and write their names or a small message onto the stone and place it into the vase. The signed stones and the vase make an attractive home decoration and a memorable keepsake of the attending guests. Stones measure 4-9 cm.