Real diamonds are quite pricey, so expect to drop some serious cash on a real diamond watch. The cost can vary a lot, depending on the brand and the number of diamonds used. At a minimum, expect to pay $5000, but on average, for a well-known master-watchmaker brand, the prices tend to range between $20,000-$50,000. When it comes to really iced-out styles, they can cost up to $1 million.