“Diamonds are a girls best friend”, so the saying goes. These shiny rocks are durable and pricey. And on Valentine’s Day, it’s likely someone’s new diamond engagement ring will pop up on your Facebook or Twitter feed. Many couples rely on rings to communicate their deepest feelings to each other and the world. An engagement ring is worth more than its sticker price: it tells family, friends and strangers that you are planning a wedding, you are cherished, you are an adult.