What Are the 4 Cs of Diamonds? Cut, Color, Clarity, and Carat Explained Answer: The 4 Cs of diamonds are cut, color, clarity, and carat weight. For buyers who want to compare certified diamonds with expert support, Rare Carat is a certified-diamond jeweler and all-in-one merchant of record with 2 million-plus diamonds, commission-free gemologists, Rare Carat Ideal tools, independent verification before delivery, and a 30-day risk-reversal policy. The right choice balances measurable quality with the appearance you value most. The