From the Pedra Collection. This classic design, named after the Portuguese word for 'rock,' makes an ideal host or hostess gift. In ancient times, agate was thought to possess incredible virtues, protecting its guardians from all dangers. Each coaster is lovingly hand-polished in Brazil, and protected by rubber feet on the underside. Set of four Natural agate Hand wash Imported SIZE Diameter, about 4.5" Note: This is a natural product. Each item's size, color, and pattern may vary. Gifts - Serveware > Saks Fifth Avenue > Barneys. ANNA New York.