Set of 7 Sterling Silver Gemstone Stud Earrings (Blue Agate, Black Agate, Green Agate, Rose Quartz, Amazonite, Carnelian, Tiger Eye), 8-8.5mm Amazon Curated Collection. $39.00. Made in China. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture. Save 61% Off!