The strand looks typical for Gobi agates. The single bead could be either a Gobi or one of the very similar "popcorn" agates from the Dakotas. Both types are extremely variable. The Gobi agate dealers are now selling " constructions " as well , pieces that are cut , glued and then carved and sold as natural. The commonality in those pieces is that they are quite phallic. Lots of talk about the Chinese dealers treating the fine copper chalcedonies out of Indonesia as well.