·The product is gold plated xuping - also called medical gold. It is a very minimal product - it may not be suitable for people with large ear folds - It is more suitable for small and medium-sized ears. ·Color change is minimized - durability is at the highest level. ·The stones are zircon. ·You do not need to have a pierced ear to use it - it can be used by compression method. ·Sold individually. ·Does not affect pool and sea water. It should be protected from chemicals. Since it is a hygiene group product, it is not suitable for exchange or return.