shape
carat
color
clarity

size of diamond

Sopy

Rough_Rock
Joined
Dec 19, 2015
Messages
21
what is the difference in size .84 vs .90?
 

Gem Queen

Brilliant_Rock
Joined
Mar 26, 2008
Messages
548
.6 points. Not much.
 

ssgg

Rough_Rock
Joined
Dec 25, 2015
Messages
28
size ultimately depends on the cut. so just take a look at the measurements.

Otherwise, it shouldn't be that much difference.
 

Andelain

Ideal_Rock
Joined
Mar 10, 2010
Messages
3,524

Sphene

Brilliant_Rock
Joined
Jan 4, 2015
Messages
666
:wall:
 

Andelain

Ideal_Rock
Joined
Mar 10, 2010
Messages
3,524
Sphene|1451212931|3966704 said:

I agree. All he has to do is look at the listed diameter of each stone, and do a bit of math.
 

pyramid

Ideal_Rock
Premium
Joined
Nov 10, 2002
Messages
4,607
1 carat is 100 points and well cut should be 6.5mm. A 0.84 point would be about 6mm so half of a mm smaller than 1 carat, so between 0.84 and 0.90 you are talking about fractions of a quarter mm, look at a ruler and divide a mm into 4 and that is a quarter mm so smaller than that. Diamonds however shine bright so these fractions seem to look more.
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
58,547
Some .90's are bigger than .84's, and some .84's are larger than some .90's. As others have said, all you have to do is compare diameters. And use those parameters I gave you in another thread to narrow down your GIA Excellent cut diamonds.
 

Niel

Super_Ideal_Rock
Premium
Joined
Jul 23, 2012
Messages
20,061
So this question depends on a few things. Are we talking about identically cut rounds of a different ctw, or different shapes, or the same shape but different cut quality.

So we'll start with the easiest. Two rounds of ideal cut, with the size be noticeable? To most, no. As its about the different of a mm all around. That is negligible. Typically you need about 2-3mm to notice a difference. Sense you will not be wearing a .84 and .9 next to each other, on the hand the size will not be noticeable :)

Two different shapes? Now that's going to look very different depending on what shape. There are a few shapes that, in general , look large for their ctw. Pears, marquise, and ovals come to mind. Cushions, asschers, emeralds usually look a tad smaller for their ctw. Now, this is generally here. Some diamonds are "deep" or "shallow" for their particular cut. A deep stone will hide ctw in its bottom, a shallow stone will do the opposite.

This takes us to the last option. Maybe you're comparing two similar shapes, like a round, but the cuts are different. One is ideally cut, one is not. The ideal cut stone will look its weight. It won't be too deep or shallow. You can't say the same for a poorly cut one. Typically they are cut to save a ctw. So, lets say they could cut an ideal cut stone at .8cts or a fair cut stone at 1ct ... They'll cut it fair to reach that 1ct mark. So, in an example like that, both a .8ct ideal cut stone and a 1ct fair grade stone could both be 6mm across
 
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