values are only what someone is willing to pay, and they constantly shift. You will have to watch auctions and public sales to find out current values. Ebay ad prices are mainly optimism... Completed Listings tell the story. A lot depends on condition, rarity, popularity, color, size, auction fever. Age is only part of the equation. You can look at the Picard Museum web site to see their current offerings, but their prices are generally upper end. I have no idea if they are firm on price. If someone puts a bead up for sale which does not sell after awhile, that usually indicates the item has been over priced or something is wrong with it.

I'm still learning about dating these beads. I am unable to help with that.