Rubies are the most valuable members of the corundum family. A large, gem-quality ruby can be more valuable than a diamond of similar size, and it would be less common. The origin of the stone matters in determining its value. Custom cut and recut stones are usually worth more per carat. Also important is color, size, and clarity. The stone in your ring is probably valued somewhere between $100 and $3,000, but could be worth much more. We recommend that you bring your ring to our free appraisal to find out more.