Greetings! It looks like an ancient agate, typical of agates that used to come out of Yemen. Probably made in India, or the Middle East. Wish I'd bought a strand more than 10 years ago!

Thanks for the info Joyce! Any idea on the value in today's market?

Not for me to judge, but if you check eBay, it's entertaining and can give one an idea of what the market currently bears. Be aware there are a LOT of fakes on this venue, but some very GOOD genuine material as well. Here's the current list of completed offerings, highest first, for "ancient agate bead".

Thanks again Joyce! I appreciate the help. I have bought from Best-Store Hong Kong before on eBay, and they were introduced to me from another collector, Kevin Ball. They seem to be on the up and up.