Gift Certificate Terms: Gift certificates are void where prohibited or restricted by law. Gift certificates cannot be used to purchase gift certificates. Gift certificates have no cash value. If the price of a service or product increases River Rock Health Spa reserves the right after one-year from the purchase date of the gift certificate to require the recipient of the gift certificate to pay the difference in the cash value of the gift certificate and the actual price of service. River Rock Health Spa reserves the right to refuse service or reverse any gift certificate purchase for any reason and return the funds to the purchaser.