Well I dont know too much about crystals but I do know that amethyst is a calming stone and its used for psychic powers, healing, stress and protection. Rose quartz is used for love, positive influence, self acceptance and peace. I dont know about silver and gold, I too prefer silver over gold, but not sure what that means. Maybe your attracted to those stones because you need more of those properties in your life. I would try working with them and feel their energy. You might find that they help you. I love both of those stones, Amethyst is actually my birthstone

Good luck to you!