I made these 2 charms from vintage screw-back earrings. I replaced all the rhinestones with Preciosa, Czech crystals and 2 part epoxy resin. The resin I use is 7 on the MOHS hardness scale. It dries as hard as quartz without being brittle.
These charms are ready to serve for 100 years or more with care.
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Questions? Please don't hesitate to ask; I answer promptly.