How big is a 10 carat pear shaped diamond?

By HeyGema™ · Updated

In short

A 10 carat pear shaped diamond measures about 18.3 x 11.8 mm. It faces up 3% smaller than a round diamond of the same weight. On a size 6 finger it covers 72% of the width. For the same weight, a round diamond is 13.9 mm.

Carat to mm calculator

About 18.3 x 11.8 mm

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

10 ct pear
18.3 x 11.8 mm
10 ct round
13.9 mm
Side by side
10 ct round inside 10 ct pear
A 10 carat pear diamond beside a 10 carat round, to the same scale.

10 carat pear diamond size

A well-cut 10 carat pear shaped diamond measures about 18.3 x 11.8 mm (0.72 x 0.47 inches) at a length-to-width ratio of 1.55:1. It faces up 3% smaller than a round diamond of the same weight. It weighs 2.00 grams.

10 carat pear size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 10 carat sizes at each ratio. A longer ratio runs the stone along the finger and makes it look slimmer. The face-up area stays almost the same.

1.40:1
Length x width: 17.4 x 12.4 mm
Width on the finger: 75% of a size 6 finger
1.50:1
Length x width: 18.0 x 12.0 mm
Width on the finger: 73% of a size 6 finger
1.55:1
Length x width: 18.3 x 11.8 mm
Width on the finger: 72% of a size 6 finger
1.60:1
Length x width: 18.6 x 11.6 mm
Width on the finger: 71% of a size 6 finger
1.70:1
Length x width: 19.2 x 11.3 mm
Width on the finger: 68% of a size 6 finger

10 carat pear on a finger

11.8 mm
11.8 mm stone on a 16.5 mm finger: it covers 72% of the widthA 10 carat pear diamond on a size 6 finger.
4
Finger width: 14.9 mm
Pear covers: 80%
5
Finger width: 15.7 mm
Pear covers: 76%
6
Finger width: 16.5 mm
Pear covers: 72%
7
Finger width: 17.3 mm
Pear covers: 68%
8
Finger width: 18.1 mm
Pear covers: 65%
9
Finger width: 18.9 mm
Pear covers: 63%

Pear sizes near 10 carat

6 carat
Length x width: 15.4 x 10.0 mm
Round of the same weight: 11.7 mm
8 carat
Length x width: 17.0 x 11.0 mm
Round of the same weight: 12.9 mm
10 (this page)
Length x width: 18.3 x 11.8 mm
Round of the same weight: 13.9 mm

10 carat in other shapes

Every row is a well-cut diamond of 10 carat. The last column is the face-up size against the pear.

Round
Length x width: 13.9 mm
Against pear: +3%
Oval
Length x width: 17.2 x 11.8 mm
Against pear: +9%
Cushion
Length x width: 12.1 x 12.1 mm
Against pear: -12%
Princess
Length x width: 11.8 x 11.8 mm
Against pear: -5%
Emerald cut
Length x width: 15.1 x 10.8 mm
Against pear: +7%
Asscher
Length x width: 11.8 x 11.8 mm
Against pear: -13%
Radiant
Length x width: 14.0 x 10.8 mm
Against pear: same
Marquise
Length x width: 22.4 x 11.2 mm
Against pear: +19%
Heart
Length x width: 14.0 x 14.0 mm
Against pear: -15%
Trillion
Length x width: 15.1 x 15.1 mm
Against pear: -11%
Baguette
Length x width: 17.2 x 8.6 mm
Against pear: +1%

Questions

A 10 carat pear shaped diamond is about 18.3 x 11.8 mm at the usual 1.55:1 ratio.
No. Face-up, a 10 carat pear is 3% smaller than a 10 carat round (13.9 mm).
There is no rule. The stone is wider than most fingers. 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.

More size charts