The stones of these earrings are real quartz crystals.
Can be repeated and modified on request, but keep in mind that they will never look exactly the same as real quartz crystals are all different shapes and forms.
Please let me know if you would like to see more photos of it, or if you have any questions.
P.S. There is a similar type of necklace to these earrings, which can make it a nice kit together (see the last photo in the gallery). The link to the necklace - https://www.bydarktales.com/product-page/medieval-crystals-necklace