Gift Certificates Gift Giving Made Simple To take the guesswork out of gift giving, simply call our office to send a Gift Certificate with a personalized message. Email us or call (212) 869-4465 with a credit card number. We will email or mail you a custom certificate, for any amount or for a more specific item. (i.e. The guard ring of your dreams awaits you at Z & Z). Our ultimate goal is to create fine jewelry that brings joy on a daily basis and will last for generations. Zwikker & Zacher Ltd.