3 Carat Diamonds

There is a wide variation of price for a 3 carat diamond, depending on the grade of the stone. Three carat diamonds typically cost anywhere from tens of thousands USD to hundreds of thousands USD. A 3 CT diamond’s grading along the 4Cs will influence its price. If you are purchasing a complete style rather than a loose 3 carat diamond, the additional designs of the jewelry will also impact its price. For example, a 3 carat diamond ring price will likely be more than the loose stone because the metal, complexity and additional features cost more than a diamond on its own. The trade-off is that you’re purchasing a complete jewelry piece.

The shape of the diamond varies the size of the 3 carat diamond. A round 3 carat diamond measures 9.3mm, while a 3 carat marquise-cut diamond measures 14 x 7mm. Our diamond carat size chart helps you compare all the shapes and carat weights.

Of all of the 4Cs, the most important one to prioritize is cut. Diamond cut refers to the proportions of the facets. An ideal cut maximizes the amount of light reflected through the diamond for brilliance, which is what makes our Astor by Blue Nile™ diamonds so popular.

Get the size of a 3 carat diamond at a lower price by shopping for a diamond with a weight of just under three carats. This is known as “buying shy” and is a popular choice for maximizing budget for a 3 carat engagement ring or other styles.

The right size for an engagement ring all depends on the wearer’s personality and style. For many, a 3 carat engagement ring is the perfect size!

CTW refers to the total carat weight of a piece of jewelry. This includes all the diamonds in the piece, including smaller accent stones. Halo rings and styles with smaller gems that complement a larger diamond will often have a CTW. A 3 CT ring, on the other hand, is a rating for the single diamond in a piece. A 3 carat solitaire diamond ring will have one diamond that weighs 3 carats.

At Blue Nile, we are proud to offer 3 carat diamonds that have been graded by the Gemological Institute of America. Our diamonds are GIA certified, meaning that they are accompanied by transparent reports and their most important qualities have been quantified. Purchasing a 3 carat diamond is worry-free with our certified diamonds.