How Big is One Carat?

I found this great resource on the Gemological Institute of America's website.

It has a slider which allows you to check the size of a diamond and you can even compare it to second stone to compare the difference.

This slider only shows the size of round cut diamonds, but these are the most popular cut,

here it is:

http://gia4cs.gia.edu/EN-US/diamond-carat-weight.htm


Princess cut diamonds and other fancy cuts are nice for variety, but the round cut diamond has been engineered in such a way to get the best light performance. Occasionally you may get similar shininess from other cuts if they are signature diamond cuts.

But back to diamond sizes: A 1 carat round cut diamond, when cut well, will be about 6.5 mm across.  

It's difficult to see this if the diamond is in a setting particularly if it is in a setting which has a lip around the entire diamond (a bezel setting). The prong settings are popular as they display more of the diamond and this allows the light to reach the diamond and bounce around inside it and flash back at the eye of the beholder.

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