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Gypsy

Super_Ideal_Rock
Joined
Aug 8, 2005
Messages
40,198
So I was talking to another PSer a while back and I said something about the spread of a diamond and she was like... and your point is? I just assumed that every Pser knows what the face up sizes of the different shapes are at 1 carat or so. Turns out I was wrong so...

Here's a quiz: (we'll do the answers on Friday).

What is the approximate face up of the following shapes at 1 carat (ranges for fancy's):

1. Well cut one carat round brilliant?

2. Well cut one carat square princess?

3. Well cut one carat square cushion?

4. Well cut one carat rectangular cushion?

5. Well cut one carat rectangular emerald cut?

6. Well cut one carat square emerald cut?
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
56,133
Ha! I surely can't answer those without looking them up! I know they are all less than the round, which should be about 6.5mm. I know different weight round diameters pretty well because that is mainly what I look at. I have been looking at the AVC's lately and the square ones cts. run close to 6mm.
 

jstarfireb

Ideal_Rock
Joined
Mar 24, 2007
Messages
6,232
All I know is that a round should be about 6.5mm and a princess about 5.5mm, give or take a tad.
 

shimmer

Brilliant_Rock
Trade
Joined
May 7, 2007
Messages
1,702
Gypsy|1319068371|3043824 said:
So I was talking to another PSer a while back and I said something about the spread of a diamond and she was like... and your point is? I just assumed that every Pser knows what the face up sizes of the different shapes are at 1 carat or so. Turns out I was wrong so...

Here's a quiz: (we'll do the answers on Friday).

What is the approximate face up of the following shapes at 1 carat (ranges for fancy's):

1. Well cut one carat round brilliant? 6.5mm

2. Well cut one carat square princess? 5.7mm

3. Well cut one carat square cushion? 6mm

4. Well cut one carat rectangular cushion? 6.2 x 5.5

5. Well cut one carat rectangular emerald cut? 7 x 5

6. Well cut one carat square emerald cut? 5.5mm
Fun thread Gypsy!
 

manderz

Brilliant_Rock
Joined
Mar 8, 2010
Messages
1,539
Interesting. I know that a rb should be around 6.5mm, but beyond knowing that others face up a bit smaller, I'm at a loss.
 

zoebartlett

Super_Ideal_Rock
Joined
Dec 29, 2006
Messages
12,450
manderz|1319077720|3043939 said:
Interesting. I know that a rb should be around 6.5mm, but beyond knowing that others face up a bit smaller, I'm at a loss.
Yeah, I don't know the others either.
 

yennyfire

Ideal_Rock
Trade
Joined
Jun 6, 2010
Messages
6,572
Zoe|1319103132|3044049 said:
manderz|1319077720|3043939 said:
Interesting. I know that a rb should be around 6.5mm, but beyond knowing that others face up a bit smaller, I'm at a loss.
Yeah, I don't know the others either.
Thritto.
 

Gypsy

Super_Ideal_Rock
Joined
Aug 8, 2005
Messages
40,198
yennyfire|1319112672|3044081 said:
Zoe|1319103132|3044049 said:
manderz|1319077720|3043939 said:
Interesting. I know that a rb should be around 6.5mm, but beyond knowing that others face up a bit smaller, I'm at a loss.
Yeah, I don't know the others either.
Thritto.

Such interesting results so far!
 

Skippy123

Super_Ideal_Rock
Joined
Nov 24, 2006
Messages
24,299
diamondseeker2006|1319071445|3043854 said:
Ha! I surely can't answer those without looking them up! I know they are all less than the round, which should be about 6.5mm. I know different weight round diameters pretty well because that is mainly what I look at. I have been looking at the AVC's lately and the square ones cts. run close to 6mm.
this.

I only know that a RB looks bigger than a princess due to cut size and that people complain about the face up of asschers. I love me an asscher or octavia though!!! Oh and Pears and Marquise look bigger since they are elongated.
 

amc80

Ideal_Rock
Joined
Jun 18, 2010
Messages
5,765
All I know is a RB should be 6.5 and a 2ct RB should be around 8.
 

kelpie

Ideal_Rock
Joined
Jan 8, 2008
Messages
2,362
I think surface area is a more accurate consideration corresponding to the visual impression of diamond size. The corners of a square stone add surface area but not spread. Still trying to figure out how to calculate surface area for a pear....
 

rubybeth

Ideal_Rock
Joined
Nov 12, 2007
Messages
2,567
Skippy|1319141858|3044381 said:
diamondseeker2006|1319071445|3043854 said:
Ha! I surely can't answer those without looking them up! I know they are all less than the round, which should be about 6.5mm. I know different weight round diameters pretty well because that is mainly what I look at. I have been looking at the AVC's lately and the square ones cts. run close to 6mm.
this.

I only know that a RB looks bigger than a princess due to cut size and that people complain about the face up of asschers. I love me an asscher or octavia though!!! Oh and Pears and Marquise look bigger since they are elongated.
I thought pears and marquise cuts look bigger because they are shallower than other cuts?
 

amc80

Ideal_Rock
Joined
Jun 18, 2010
Messages
5,765
kelpie|1319150790|3044470 said:
I think surface area is a more accurate consideration corresponding to the visual impression of diamond size. The corners of a square stone add surface area but not spread. Still trying to figure out how to calculate surface area for a pear....
It's been a while since I've taken math, but wouldn't it be the area of a triangle plus the area of a semi-circle?
 

violet3

Ideal_Rock
Premium
Joined
Dec 18, 2007
Messages
3,793
i have no idea, but i can't wait to see the results! I only know that asschers face up small and RBs face up large (i think?)
 

daintyG

Brilliant_Rock
Joined
Sep 23, 2011
Messages
579
I'm not a well-seasoned PSer, so I just know the dimensions for the shapes that I'm particularly interested in.

You forgot to list MQ cuts for your quiz. ;-) I don't remember the width, but the length should be about 10 mm. That's one thing to love about MQ cuts, even though they aren't popular anymore.
 

decodelighted

Super_Ideal_Rock
Joined
Jul 27, 2005
Messages
11,534
daintyG|1319172078|3044662 said:
I'm not a well-seasoned PSer, so I just know the dimensions for the shapes that I'm particularly interested in.

You forgot to list MQ cuts for your quiz. ;-) I don't remember the width, but the length should be about 10 mm. That's one thing to love about MQ cuts, even though they aren't popular anymore.
It could change. I noticed Christina Applegate's character is wearing a marquise cut engagement set on the new show "Up All Night".
 

Amys Bling

Super_Ideal_Rock
Joined
Jun 25, 2010
Messages
11,025
jstarfireb|1319071599|3043858 said:
All I know is that a round should be about 6.5mm and a princess about 5.5mm, give or take a tad.
That's the extent of my knowledge!
 

Gypsy

Super_Ideal_Rock
Joined
Aug 8, 2005
Messages
40,198
shimmer|1319076345|3043918 said:
Gypsy|1319068371|3043824 said:
So I was talking to another PSer a while back and I said something about the spread of a diamond and she was like... and your point is? I just assumed that every Pser knows what the face up sizes of the different shapes are at 1 carat or so. Turns out I was wrong so...

Here's a quiz: (we'll do the answers on Friday).

What is the approximate face up of the following shapes at 1 carat (ranges for fancy's):

1. Well cut one carat round brilliant? 6.5mm

2. Well cut one carat square princess? 5.7mm

3. Well cut one carat square cushion? 6mm

4. Well cut one carat rectangular cushion? 6.2 x 5.5

5. Well cut one carat rectangular emerald cut? 7 x 5

6. Well cut one carat square emerald cut? 5.5mm
Fun thread Gypsy!

Shimmer got all the answers. :appl: Shimmer, if you spent more time on RT you would be a great help!

I would only add that both the rectangular cushion and the square emerald cut dimensions are 'minimums' you can get bigger, but you shouldn't get smaller.

With the other dimensions you can get slightly less and it would still be well cut.
 

Clairitek

Ideal_Rock
Joined
Jul 21, 2008
Messages
4,881
Gypsy|1319068371|3043824 said:
So I was talking to another PSer a while back and I said something about the spread of a diamond and she was like... and your point is? I just assumed that every Pser knows what the face up sizes of the different shapes are at 1 carat or so. Turns out I was wrong so...

Here's a quiz: (we'll do the answers on Friday).

What is the approximate face up of the following shapes at 1 carat (ranges for fancy's):

1. Well cut one carat round brilliant?

2. Well cut one carat square princess?

3. Well cut one carat square cushion?

4. Well cut one carat rectangular cushion?

5. Well cut one carat rectangular emerald cut?

6. Well cut one carat square emerald cut?
1. About 6.5 mm in diameter
2. About 5.8 mm x 5.8 mm
3. A smidge less than 6x6mm
4. & 5. are tough for me since I am not sure what an ideal aspect ratio would be.
6. 6x6
 

Gypsy

Super_Ideal_Rock
Joined
Aug 8, 2005
Messages
40,198
diamondseeker2006|1319419113|3046231 said:
Shimmer, did you really have all those memorized? I am impressed if you did! I don't have them memorized because I usually only help with round threads, or with cushions, I ask to see the pictures!

Plus, I use this if I really need to know!

http://www.gemnation.com/images/actual-diamond-size-comparison.pdf
DS I have them memorized and that's how I knew her answers were right and I never checked a source. Spread is always interesting to me, so I memorized it.
 
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