1. Treatment process: electroplating 2. Classic and romantic style and truly a gorgeous addition to any jewelry collection. 3. Contact with oily hard substances and chemicals, cleaning with warm water, wiping with soft cloth and do not wearing when bathing. 4. Applications: perfect gift for your daughter, lover, girlfriend, wife, mother, couple, valentine or just a friend, etc; really a fantastic gift for important days in one year, like: anniversaries, birthdays, weddings,Valentine s Day, Christmas etc, or just as a surprise to remind that special one how much you care.