There are a number of aspects that impact an Emerald Stone value, but colour is the most important one. A widely sought-after colour is a bright, brilliant green with blue undertones. Clarity is also important; yet, unlike diamonds, emeralds' inclusions are frequently accepted, if not celebrated. Carat weight and cut also affect value. To enhance its brilliance and colour, emeralds are usually cut into a rectangular or square form, a technique called the "emerald cut."