This is a 31 inch hand-knotted Infinity necklace made of Crazy Lace Agate and Baroque Fresh Water Pearls (Rosebud Pearls).
Agate is a hard semi-precious stone that has been carved since Antiquity to make impression seals in wax, used to seal documents and letters. Crazy Lace agate from Mexico comes in a variety of colors and is marked by many loop and swirl patterns.