Diamond Size Simulator

How big is a 1 carat diamond?... It's around 6.5mm... OK, but how big is 6.5mm exactly? And how would it look on my size 6 finger?

Welcome to Diamond Database where all of these questions and much much more will be answered. This website is a platform for comparing and learning about diamond shapes and sizes. It features a diamond ring simulator where you can compare actual diamond sizes on an actual sized ring and finger. It also provides tons of useful info including size evaluation and detailed buying guides.

Whether you are buying an engagement ring, are an aspiring gemologist, or just curious about diamonds, you've come to the right place. Now go ahead, start exploring different shapes below or jump straight into the size simulator.

Compare diamonds

Diamond Shapes

Round Brilliant Designed for maximum sparkle, Round Brilliant is by far the most popular diamond cut. The ultimate classic...

Princess Cut Princess is a contemporary cut with square lines, sharp corners, and high degree of brilliance...

Radiant Cut Radiant combines the brilliance and fire of the Round Brilliant with an elegant look of the Emerald....

Oval Cut A fiery cut combining the sparkle of the Round Brilliant with an elongated, elliptical outline...

Marquise Cut A majestic, elongated cut with tapering points at both ends. Very regal and quite striking...

Heart Cut As a symbol of love, Heart is the most explicitly romantic of all diamond shapes. Gentle and affectionate...

Emerald Cut One of the classics of diamond shapes, Emeralds are known for their elegance and exquisite beauty...

Cushion Cut A round-cornered, squarish-rectangular, pillow resembling shape with strong romantic appeal...

Asscher Cut A squarish Asscher cut is a variation of the Emerald cut with almost octagonal shape. Uniquely regal...

Pear Cut Resembling a teardrop, Pear cut is a unique, feminine shape with one end tapering to a point...

Trillion Cut A dazzling and lively triangular shaped cut with sharp brilliance and fire. Versatile and beautiful...

Knowledge Base

Carat Weight vs. Face-Up Size

Analysis of a relationship between carat weight and face-up size. Find out which shape faces up the largest. Spoiler alert: it's Marquise.

Evaluating Diamond Size

Evaluating diamond face-up size can be rather tricky, especially for fancy shapes. Learn why it's important, how it works and how accurate it is.

Where To Buy Diamonds?

Shopping for a diamond can be quite a challenge, especially for first-time buyers. Learn where to get the most bang for your buck.