How big is a 0.5 carat zircon?

By HeyGema™ · Updated

In short

A 0.5 carat round zircon measures about 4.7 mm across (0.18 inches), 9% narrower than a 0.5 carat diamond (5.1 mm). An oval of the same weight is 5.8 x 4.0 mm and an emerald cut 5.0 x 3.6 mm.

Carat to mm calculator

About 4.7 x 4.7 mm

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

Round
4.7 mm
Oval
5.8 x 4.0 mm
Cushion
4.0 x 4.0 mm
Princess
4.0 x 4.0 mm
Emerald cut
5.0 x 3.6 mm
Asscher
4.0 x 4.0 mm
Radiant
4.7 x 3.6 mm
Pear
6.1 x 4.0 mm
Marquise
7.5 x 3.8 mm
Heart
4.7 x 4.7 mm
Trillion
5.0 x 5.0 mm
Baguette
5.8 x 2.9 mm
= 2 mm in every picture above
A 0.5 carat zircon in 12 shapes, drawn to one scale.

0.5 carat zircon size by shape

Face-up measurements of a well-cut 0.5 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: 4.7 mm
In inches: 0.18 in
Oval
Length x width: 5.8 x 4.0 mm
In inches: 0.23 x 0.16 in
Cushion
Length x width: 4.0 x 4.0 mm
In inches: 0.16 x 0.16 in
Princess
Length x width: 4.0 x 4.0 mm
In inches: 0.16 x 0.16 in
Emerald cut
Length x width: 5.0 x 3.6 mm
In inches: 0.20 x 0.14 in
Asscher
Length x width: 4.0 x 4.0 mm
In inches: 0.16 x 0.16 in
Radiant
Length x width: 4.7 x 3.6 mm
In inches: 0.18 x 0.14 in
Pear
Length x width: 6.1 x 4.0 mm
In inches: 0.24 x 0.16 in
Marquise
Length x width: 7.5 x 3.8 mm
In inches: 0.30 x 0.15 in
Heart
Length x width: 4.7 x 4.7 mm
In inches: 0.18 x 0.18 in
Trillion
Length x width: 5.0 x 5.0 mm
In inches: 0.20 x 0.20 in
Baguette
Length x width: 5.8 x 2.89 mm
In inches: 0.23 x 0.11 in

0.5 carat zircon against other gems

Diamond
Round, 0.5 carat: 5.1 mm
Moissanite
Round, 0.5 carat: 5.3 mm
Sapphire
Round, 0.5 carat: 4.9 mm
Ruby
Round, 0.5 carat: 4.9 mm
Emerald
Round, 0.5 carat: 5.6 mm
Aquamarine
Round, 0.5 carat: 5.6 mm
Morganite
Round, 0.5 carat: 5.5 mm
Tanzanite
Round, 0.5 carat: 5.2 mm
Zircon (this page)
Round, 0.5 carat: 4.7 mm

0.5 carat zircon on a finger

4.7 mm
4.7 mm stone on a 16.5 mm finger: it covers 28% of the widthA round 0.5 carat zircon on a size 6 finger.
4
Finger width: 14.9 mm
Round covers: 31%
Oval covers: 27%
5
Finger width: 15.7 mm
Round covers: 30%
Oval covers: 25%
6
Finger width: 16.5 mm
Round covers: 28%
Oval covers: 24%
7
Finger width: 17.3 mm
Round covers: 27%
Oval covers: 23%
8
Finger width: 18.1 mm
Round covers: 26%
Oval covers: 22%
9
Finger width: 18.9 mm
Round covers: 25%
Oval covers: 21%

Zircon at nearby weights

0.5 ct (this page)
Round diameter: 4.7 mm
1 carat zircon
Round diameter: 5.9 mm

Questions

A round 0.5 carat zircon is about 4.7 mm across. Other shapes are longer than they are wide: an oval is 5.8 x 4.0 mm.
No. A round 0.5 carat zircon is 9% narrower than a 0.5 carat diamond (5.1 mm).
0.10 grams. A carat is 200 milligrams for every gem.
A round 0.5 carat zircon covers 28% 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