Jewelry looks it’s best when cleaned. Properly clean your jewelry before showing it around. If you do not know the 100% correct way to clean your piece of jewelry let a professional jeweler clean it for you. Some jewelry stores may even clean it for free. Warning: the wrong cleaning can damage and even destroy jewelry. If your are unsure of how to clean the jewelry or gem, let the professionals do it.
If you choose to buy one, go for the kind that she is likely to accept, since it is not good to ask her before purchasing. Ensure that you keep the purchase documents like receipts safely, so that you return for exchange in case she refuses to take it. It is also important that you insure the ring as you may not know what happens. This insurance can include travel; that is if you want to propose to her abroad.