Our tool will help you determine the right diamond size. Simply enter your desired
carat size (or dimensions) and shape in the fields below. The exact diamond shape
will show up on the model finger which can be customized by adjusting the
finger size or ring width.Once you've found the right size, click the button in the "Find the Best" and we'll help
you find the right diamond for the best value.
To help you compare different carat sizes, we created the preview charts below for the most popular shapes including: Princess, Round, Cushion, Marquise and Emerald.
To see sizes for all diamond shapes, click on the button below to download our full printable diamond size chart. Download All Sizes
Blue Nile Blue Nile is the largest and most well known internet jewelry seller. They have a very large exclusive online inventory. Their high quality images are catching up to James Allens' and their prices are amazing. Blue Nile is currently running a limited time sale offering 15% on settings site-wide. Click here to browse some great settings.
No questions asked returns within 30 days of shipment. Blue Nile will send you a paid shipping label to return the ring.
Lifetime Warranty
Free Shipping
Free prong tightening, repolishing, rhodium plating and cleaning every 6 months
Provide insurance appraisal
One free resizing within the first year of purchase
High quality images of about half of their diamonds
24/7 Customer Service
100% credit towards future upgrades (must be at least double in value)
Best in class fulfillment
James Allen James Allen is the leader in online diamond sales. Their imaging technology is the same as inspecting a diamond with a jeweler's loupe. They have the largest exclusive loose diamond inventory online and fantastic prices. They also have the nicest collection of lab created diamonds online.
No questions asked returns within 30 days of shipment. James Allen will send you a paid shipping label to return the ring.
Lifetime Warranty
Free International Shipping
Free prong tightening, repolishing, rhodium plating and cleaning every 6 months
Provide insurance appraisals
One free resizing within 60 days of purchase
Free ring inscriptions
Best-in-class high quality imagery of all diamonds in stock
24/7 Customer Service
Best-in-class packaging
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