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Measurements????

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Skippy123

Super_Ideal_Rock
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Hi,
I want to know what these measurements tell me.
7.19 X 7.24 X 4.57

The first number is what, the second is what and the third is what? (ex: width, height, etc.)

I read posts saying that "oh that diamond faces up 1 carat when it is actually a .90"
I would like to know how they know that. Would the meausrements above give me that info?
Thanks,
 

Regular Guy

Ideal_Rock
Joined
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5,951
about 1.33 carat


Date: 1/23/2007 9:06:44 PM
Author:Skippy123

The first number is what, the second is what and the third is what? (ex: width, height, etc.)
Width, width (measured perpendicular to measurment #1 as the second measurement, I believe), and height, yes.

See here!
 

Skippy123

Super_Ideal_Rock
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oh my gosh, how embarrassing. I asked Priscope to move this to Rocky Talky. Wow, today really is not my day
 

diagem

Ideal_Rock
Trade
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Date: 1/23/2007 10:17:53 PM
Author:Skippy123
Hi,
I want to know what these measurements tell me.
7.19 X 7.24 X 4.57

The first number is what, the second is what and the third is what? (ex: width, height, etc.)

I read posts saying that ''oh that diamond faces up 1 carat when it is actually a .90''
I would like to know how they know that. Would the meausrements above give me that info?
Thanks,
In my opinion if the stone is a round shape it would weight around 1.45 carats.
If a square shape than it would weight approx. 1.90 carats.

7.19 is width, 7.24 is lenght, 4.57 is depth in mm. size.
 

starryeyed

Ideal_Rock
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Nov 6, 2006
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2,398
Hi Skippy.

I'm not clear about the shape of the stone, but if it's a RB, I agree with DiaGem that the stone is about 1.45 carats. Here is a thread that gives equations to calculate carat weight from measurements for various shapes:

Carat Weight Calc from Measurements-various shapes

I believe these formulas are based on ideal proportions, so the accuracy in a particular application probably depends on how well the actual diamond is cut.

The carat weight formula for RB (with ideal proportions) is diameter x diameter x depth x 0.0061. You could probably back-figure with this formula for a RB to figure what the diameter should be for a certain carat weight. For example, I believe the depth on a Tolkowsky is 59.3%. Therefore, depth = 0.593 x diameter.

diameter x diameter x 0.593 x diameter x 0.0061 = 1.45
diameter = 7.37 mm

For a 1.45 carat diamond cut with ideal proportions, the diameter should be around 7.37 mm. I agree with Avlis that this diamond is deep, which is why it may "face-up" small.

Another thing to look at if this is a RB is how much variation is there between the first two diameter measurements. If they are close, then the circle is pretty plumb, but if they vary by a lot, the circle is out-of-round.

Hope this helps.
 

strmrdr

Super_Ideal_Rock
Joined
Nov 1, 2003
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23,295
Date: 1/24/2007 9:53:22 AM
Author: avlis
that stone is a little deep.
depends on the shape.
For a round yes for pretty much any other shape it isnt.
 

Skippy123

Super_Ideal_Rock
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Nov 24, 2006
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24,299
another question
should with and legth be about the same on a RB?
 

starryeyed

Ideal_Rock
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Date: 1/24/2007 10:28:01 PM
Author: Skippy123
another question
should with and legth be about the same on a RB?
Yes. Otherwise your RB isn''t really round!
 
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