Ruby is one of the best choices for a coloured . Ruby is the second-hardest gemstone, alongside sapphire, with a Mohs scale rating of 9. The Mohs scale indicates how susceptible a gemstone is to scratching, and ruby is an extremely hard gem that won’t scratch easily. As well as being a durable choice, ruby has deep symbolism that makes it a beautiful and romantic choice for an . Representing love, passion, and seeking your heart’s desire, ruby is a stunning way to symbolize your love and dedication to your fiancé. It’s also an eye-catchingly unique choice, with its vivid red colour that will stand out from more traditional engagement ring stones such as diamond and blue sapphire.