Thank you for the info...Clearies.... I have quite a few (50+/-)of the smaller "red/amber" that I pictured as well as 4 shooters... all are stunning under UV light. Do you know who made them? I would like to keep some and sell some but don't want to mis-advertise what I have or overprice them. I sell on ebay and have a good rep I want to keep . I just brought home 6 more jars of marbles from estate sales found today... truly an addiction, but am learning a lot and anxious to learn more!