This is an excellent red & wine colored striped agate pendant, teardrop-shaped. It comes with the copper-over pewter bail and the leather necklace.
This stone is indeed banded agate, but it has been dyed in order to obtain the unusual coloration. These come in many variations and are indeed striking.
Striped agate is a translucent, banded, often colorful variety of chalcedony (quartz). Very popular for both collectors and lovers of jewelry.