These marbles owe their fluorescence to the presence of uranium glass, which is glass mixed with uranium oxide. Uranium infused glass takes on a special appearance when exposed to even the smaller concentration of ultraviolet light from the sun. Uranium infused glass takes on a beautiful almost opalescent emerald quality when sunlight or a black light hits it just right.
I purchased these marbles from Marble Magic and More on Etsy: https://www.etsy.com/shop/MarbleMagicAndMore?utm_source=transactional&utm_medium=email&utm_campaign=convo_notifications_010170_10683759063_0_0&campaign_label=convo_notifications&utm_content=&email_sent=1668171569&euid=_WskskZsTDl1yCpmFNNnPk-43wNo&eaid=1115132247309&x_eaid=d9893e3711
IN MY VIEWFINDER 
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