Carat weight vs. mm: is there a chart?

[puravida]

Is there a chart that shows what mm dimensions a certain ct of stone should be?

For example, a 1.5 ct RB stone should be X.Xmm across?

I''m just wondering how to determine if a diamond will look small for its weight. Is it based on these mm dimensions?

 

[Brown.Eyed.Girl]

Hope this works!

Amazon Size Chart

 

[oneandahalfrock]

It should be right around 7.4-5 mm if cut well

 

[stone-cold11]

This.

 

[puravida]

Actually its 1.2 ct. So based on the charts, it should be 6.8-6.9, otherwise it''ll look small for its size?

 

[stone-cold11]

ya, around 6.85mm, ideally. If it deviate too much, it means you can buy a smaller stone and still get the same diameter. And as stone are priced primarily on the carat weight, you are paying more for less.

 

[puravida]

the stone measures 6.83.

does the 0.02 difference (From 6.85) make much of a visual difference?

 

[SpareMyWallet]

Date: 2/4/2010 9:54:54 PM
Author: puravida
the stone measures 6.83.

does the 0.02 difference (From 6.85) make much of a visual difference?

Nope

 

[Dreamer_D]

Date: 2/4/2010 9:54:54 PM
Author: puravida
the stone measures 6.83.

does the 0.02 difference (From 6.85) make much of a visual difference?

No! Look on a ruler and see how big a mm is, then mentally divide it by 50. That''s the difference we are talking about here

 

[Lorelei]

Just a quick note with these charts, according to one of the experts they can be on the optimistic side for face up size or spread so use as a guide only.

 

[stone-cold11]

deviation of around 3% is normal.

 

[Lorelei]

Date: 2/5/2010 5:51:58 AM
Author: Stone-cold11
deviation of around 3% is normal.

Yes it is, just pointing this out as some new posters can take these charts literally and get worried if a diameter doesn't quite measure up to the numbers given.