Women and mens promise rings will be made for days to come, if not for infinity, & they will last that long. Just as long your commitment should last.  If you are shopping at kays, jareds, zales, or at jcpenny.. Going into your local area store would give you a better price compared to the onlie stores for jewelry. If you are going to be shopping online, amazon would be your best bet at finding great quality, free shipping, and good prices. You can find enormous gemstones, sapphires, etc. You can find popular promise rings for couples and cute promise rings for her.