How big is a 5 carat zircon?

By HeyGema™ · Updated

In short

A 5 carat round zircon measures about 10.0 mm across (0.39 inches), 9% narrower than a 5 carat diamond (11.0 mm). An oval of the same weight is 12.4 x 8.5 mm and an emerald cut 10.9 x 7.8 mm.

Carat to mm calculator

About 10.0 x 10.0 mm

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

Round
10.0 mm
Oval
12.4 x 8.5 mm
Cushion
8.7 x 8.7 mm
Princess
8.5 x 8.5 mm
Emerald cut
10.9 x 7.8 mm
Asscher
8.5 x 8.5 mm
Radiant
10.1 x 7.8 mm
Pear
13.2 x 8.5 mm
Marquise
16.2 x 8.1 mm
Heart
10.1 x 10.1 mm
Trillion
10.9 x 10.9 mm
Baguette
12.4 x 6.2 mm
= 5 mm in every picture above
A 5 carat zircon in 12 shapes, drawn to one scale.

5 carat zircon size by shape

Face-up measurements of a well-cut 5 carat zircon. Zircon is denser than diamond (4.69 against 3.52), so it packs more weight into less space and faces up 9% narrower for the same weight.

Round
Length x width: 10.0 mm
In inches: 0.39 in
Oval
Length x width: 12.4 x 8.5 mm
In inches: 0.49 x 0.34 in
Cushion
Length x width: 8.7 x 8.7 mm
In inches: 0.34 x 0.34 in
Princess
Length x width: 8.5 x 8.5 mm
In inches: 0.34 x 0.34 in
Emerald cut
Length x width: 10.9 x 7.8 mm
In inches: 0.43 x 0.31 in
Asscher
Length x width: 8.5 x 8.5 mm
In inches: 0.34 x 0.34 in
Radiant
Length x width: 10.1 x 7.8 mm
In inches: 0.40 x 0.31 in
Pear
Length x width: 13.2 x 8.5 mm
In inches: 0.52 x 0.34 in
Marquise
Length x width: 16.2 x 8.1 mm
In inches: 0.64 x 0.32 in
Heart
Length x width: 10.1 x 10.1 mm
In inches: 0.40 x 0.40 in
Trillion
Length x width: 10.9 x 10.9 mm
In inches: 0.43 x 0.43 in
Baguette
Length x width: 12.4 x 6.2 mm
In inches: 0.49 x 0.24 in

5 carat zircon against other gems

Diamond
Round, 5 carat: 11.0 mm
Moissanite
Round, 5 carat: 11.4 mm
Sapphire
Round, 5 carat: 10.6 mm
Ruby
Round, 5 carat: 10.6 mm
Emerald
Round, 5 carat: 12.0 mm
Aquamarine
Round, 5 carat: 12.0 mm
Morganite
Round, 5 carat: 11.9 mm
Tanzanite
Round, 5 carat: 11.2 mm
Zircon (this page)
Round, 5 carat: 10.0 mm

5 carat zircon on a finger

10.0 mm
10.0 mm stone on a 16.5 mm finger: it covers 61% of the widthA round 5 carat zircon on a size 6 finger.
4
Finger width: 14.9 mm
Round covers: 67%
Oval covers: 57%
5
Finger width: 15.7 mm
Round covers: 64%
Oval covers: 54%
6
Finger width: 16.5 mm
Round covers: 61%
Oval covers: 52%
7
Finger width: 17.3 mm
Round covers: 58%
Oval covers: 49%
8
Finger width: 18.1 mm
Round covers: 55%
Oval covers: 47%
9
Finger width: 18.9 mm
Round covers: 53%
Oval covers: 45%

Zircon at nearby weights

4 carat zircon
Round diameter: 9.3 mm
5 ct (this page)
Round diameter: 10.0 mm
10 carat zircon
Round diameter: 12.6 mm

Questions

A round 5 carat zircon is about 10.0 mm across. Other shapes are longer than they are wide: an oval is 12.4 x 8.5 mm.
No. A round 5 carat zircon is 9% narrower than a 5 carat diamond (11.0 mm).
1.00 grams. A carat is 200 milligrams for every gem.
A round 5 carat zircon covers 61% of the width of a size 6 finger. Compare it with a ring you have tried on in the finger chart above.

More size charts