The 4 Cs of diamonds — a five-minute guide

Four factors set a diamond's price. Knowing them turns an intimidating purchase into a confident one.

• Cut — the only C created by human skill, and the biggest driver of sparkle. Never compromise here.
• Colour — graded D (colourless) to Z. F-H look identical to D in a set piece, at a much better price.
• Clarity — VS1/VS2 inclusions are invisible to the naked eye; paying for flawless is paying for the certificate.
• Carat — weight, not size. A well-cut 0.90ct looks nearly identical to 1.00ct and costs meaningfully less.

Our standard

Every Aurora diamond above 0.30ct is independently certified, and every stone's weight is listed in milli-carats on the price breakup. Explore the diamond collection.