The products are original rhodium plated xuping - also called medical gold. Color change is minimized - durability is at the highest level. The stones are zircon - their size is minimal - suitable for small ears. It is a compression earring. You do not need to have a pierced ear to use it. It is sold individually. It does not affect pool and sea water. It should be protected from chemicals. Since it is in the hygienic product group, it is not suitable for exchange or return.