The products are original rhodium plated xuping - also called medical gold. It is sold individually. The stones are zircon and are especially suitable for the helix area. Other areas where it can be used are tragus-lobes. Color change is minimized - durability is at a high level. 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.