All Nishi jewelry pieces are made out of 14K, 18K gold or platinum.
It is normal for jewelry to attract dirt over time, especially when it is worn daily. For at home cleaning we recommend placing jewelry in a small bowl with warm water and a mild dish detergent. Leave the piece in the solution for five minutes and then gently clean the metal and around the gemstone with a soft toothbrush - an old toothbrush works great. We do not recommend using harsh chemical cleaners, warm water and dish soap is the best combination for at home care.
We also recommend removing jewelry at night, while exercising, showering/swimming, heavy lifting and applying lotions/perfume.