With the possible exception of the horizon meeting the bright blue sky on a perfect summer day, or a sandy beach blending into a tropical bay, there may not be a more beautiful blue-and-brown combination than that of Terra Agate. The rounds even resemble little Earths, the brown spaces creating new continents aside the unfamiliar oceans. A form of chalcedony made of quartz, Terra Agate contains the best of nature in a variety of small shapes. Sterling silver toggle clasp. Necklace and Bracelet also available.