Interchangeable earrings in rhodium-plated silver with amethyst and chalcedony

Earrings in rhodium-plated 925 Sterling silver with approximately 8 mm round amethyst cabochons surrounded by white cubic zirconia in a square setting. The lower part is set with a chalcedony cabochon measuring approximately 18 x 13 mm.
The special thing about these earrings is that you can detach or replace the lower part as you wish and wear the upper parts either on their own or with other lower parts.
The earrings measure approx. 34x14 mm in total, the tops alone approx. 12x12 mm each. The weight per pair is approx. 13.3 grams. The hallmark can be found on the studs and the clasp nuts.