How big is a 0.75 carat Asscher cut diamond?

By HeyGema™ · Updated November 5, 2026

In short

A 0.75 carat Asscher cut diamond measures about 5.0 x 5.0 mm. It faces up 16% smaller than a round diamond of the same weight. On a size 6 finger it covers 30% of the width. For the same weight, a round diamond is 5.9 mm.

5.0 x 5.0 mm0.75 carat asscher
0.20 x 0.20 inthe same in inches
-16%face-up size vs a round
30%of a size 6 finger's width

Carat to mm calculator

ShapeGemCarat

About 5.0 x 5.0 mm

An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.

0.75 ct asscher

5.0 x 5.0 mm

0.75 ct round

5.9 mm

Side by side

0.75 ct asscher inside 0.75 ct round

A 0.75 carat asscher diamond beside a 0.75 carat round, to the same scale.

0.75 carat asscher diamond size

A well-cut 0.75 carat Asscher cut diamond measures about 5.0 x 5.0 mm (0.20 x 0.20 inches) at a length-to-width ratio of 1.00:1. It faces up 16% smaller than a round diamond of the same weight. It weighs 0.15 grams.

0.75 carat asscher on a finger

5.0 mm stone on a 16.5 mm finger: it covers 30% of the widthA 0.75 carat asscher diamond on a size 6 finger.

4: Finger width: 14.9 mm; Asscher covers: 34%

5: Finger width: 15.7 mm; Asscher covers: 32%

6: Finger width: 16.5 mm; Asscher covers: 30%

7: Finger width: 17.3 mm; Asscher covers: 29%

8: Finger width: 18.1 mm; Asscher covers: 28%

9: Finger width: 18.9 mm; Asscher covers: 26%

US ring size	Finger width	Asscher covers
4	14.9 mm	34%
5	15.7 mm	32%
6	16.5 mm	30%
7	17.3 mm	29%
8	18.1 mm	28%
9	18.9 mm	26%

Asscher sizes near 0.75 carat

0.33 carat: Length x width: 3.8 x 3.8 mm; Round of the same weight: 4.5 mm

0.5 carat: Length x width: 4.4 x 4.4 mm; Round of the same weight: 5.1 mm

0.75 (this page): Length x width: 5.0 x 5.0 mm; Round of the same weight: 5.9 mm

1 carat: Length x width: 5.5 x 5.5 mm; Round of the same weight: 6.5 mm

1.25 carat: Length x width: 5.9 x 5.9 mm; Round of the same weight: 6.9 mm

Carat	Length x width	Round of the same weight
0.33 carat	3.8 x 3.8 mm	4.5 mm
0.5 carat	4.4 x 4.4 mm	5.1 mm
0.75 (this page)	5.0 x 5.0 mm	5.9 mm
1 carat	5.5 x 5.5 mm	6.5 mm
1.25 carat	5.9 x 5.9 mm	6.9 mm

0.75 carat in other shapes

Every row is a well-cut diamond of 0.75 carat. The last column is the face-up size against the asscher.

Round: Length x width: 5.9 mm; Against asscher: +18%

Oval: Length x width: 7.3 x 5.0 mm; Against asscher: +25%

Cushion: Length x width: 5.1 x 5.1 mm; Against asscher: +2%

Princess: Length x width: 5.0 x 5.0 mm; Against asscher: +9%

Emerald cut: Length x width: 6.4 x 4.5 mm; Against asscher: +23%

Radiant: Length x width: 5.9 x 4.5 mm; Against asscher: +16%

Pear: Length x width: 7.7 x 5.0 mm; Against asscher: +15%

Marquise: Length x width: 9.4 x 4.7 mm; Against asscher: +37%

Heart: Length x width: 5.9 x 5.9 mm; Against asscher: -2%

Trillion: Length x width: 6.4 x 6.4 mm; Against asscher: +2%

Baguette: Length x width: 7.3 x 3.6 mm; Against asscher: +16%

Shape	Length x width	Against asscher
Round	5.9 mm	+18%
Oval	7.3 x 5.0 mm	+25%
Cushion	5.1 x 5.1 mm	+2%
Princess	5.0 x 5.0 mm	+9%
Emerald cut	6.4 x 4.5 mm	+23%
Radiant	5.9 x 4.5 mm	+16%
Pear	7.7 x 5.0 mm	+15%
Marquise	9.4 x 4.7 mm	+37%
Heart	5.9 x 5.9 mm	-2%
Trillion	6.4 x 6.4 mm	+2%
Baguette	7.3 x 3.6 mm	+16%

Questions

A 0.75 carat Asscher cut diamond is about 5.0 x 5.0 mm at the usual 1.00:1 ratio.

No. Face-up, a 0.75 carat asscher is 16% smaller than a 0.75 carat round (5.9 mm).

There is no rule. The stone is 34% of the width of a size 4 finger and 28% of a size 8. Compare it with a ring you have tried on in the finger chart above.

Yes. A lab grown diamond has the same density as a mined one, so it measures the same for the same weight.