Appraisals It is vital to keep appraisals up to date (review every five years) and accurate and it is crucial that you understand your personal policy. You can make an appointment with our certified appraiser, Marijke, to have your jewelry checked and appraised while you wait. Email us or call (212) 869-4465 for an appointment. Our ultimate goal is to create fine jewelry that brings joy on a daily basis and will last for generations. Zwikker & Zacher Ltd.