A dream about a polished gemstone symbolises that you are about to receive something beautiful. Someone will pay you a compliment or give you an unexpected gift.
A dream about receiving a gemstone symbolises that you will receive a gift or something valuable. It is important that you are aware of what you are receiving and what you are giving.
A dream in which you sell a gemstone symbolises that you will lose something valuable. You should not be careless with what you have.
A dream in which you lose a gemstone means that you will be cheated out of your hard earned money.