To imagine the diamond sizes even better, take a look at this simple image comparison to a US quarter: Consult with a professional member of our Diamonds.Pro team for more details. *Sizing of diamonds is based on averages for a brilliant round diamond. For example, a round diamond’s diameter of 9.00mm to carat is 2.75ct on average. In the diamond size chart below, we display the diamond’s diameter mm to carat weight based on averages of round brilliant diamonds. The diamond size chart is meant to be a reference point, as diameters of diamonds vary based on cut quality. Diamond Size Chart: MM to Carat WeightĪ diamond size chart can help you determine what might be the right carat weight for you by providing a mm to carat comparison. On the other hand, this beautifully cut 1 carat diamond from Blue Nile has an Ideal Cut with an easily noticeably larger diameter of 6.5mm. For example, this 1 carat diamond from Blue Nile has a terrible cut with a 66.7% depth. They will be able to help you find the balance between “getting the biggest diamond” and “not wasting money to gain carat size that won’t be noticeable.” You can also refer to our diamond size chart below.Īlways keep in mind the cut quality, since a poorly cut heavier diamond can look smaller than an excellently cut lighter diamond. You are best off asking one of our experts to guide you through this process. In reality, there is no person on earth who can tell the difference in size between these two diamonds without using a scale. After all, it’s 4% larger and only $100 more. For example you may think this diamond from Blue Nile is a great deal compared to this diamond from Blue Nile. Yet this gorgeous diamond from Blue Nile will look just as perfect as the previous diamond, yet it’s 25% larger for the same price.Īnother issue we will address is the law of diminishing returns. Keep in mind that if you follow that route, you may end up with a diamond like this one from Blue Nile for your $5,000 budget. Some salespeople might try to push “only the best” on you.

Learn More.Ĭhoose the lowest color and clarity that still look great to the naked eye, and then choose the largest diamond carat weight that still fits within your budget. We get commissions for purchases made from our affiliates through links in this article.

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