How big are 4 carat diamond stud earrings?
By HeyGema™ · Updated
In short
4 carat diamond stud earrings (ctw) are two stones of 2 carat. A round stone of 2 carat is about 8.1 mm across, a princess 6.9 x 6.9 mm and a cushion 7.1 x 7.1 mm.
- 2 cteach stone
- 8.1 mmround, across
- 0.32 inthe same in inches
Carat to mm calculator
About 8.1 x 8.1 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
Round
8.1 mm
Princess
6.9 x 6.9 mm
Cushion
7.1 x 7.1 mm
Oval
10.1 x 6.9 mm
Pear
10.7 x 6.9 mm
Heart
8.2 x 8.2 mm
= 2 mm in every picture above
4 carat total weight stud earrings in mm
A pair of 4 ctw diamond studs has two stones of 2 carat each. A round stone of that weight measures about 8.1 mm (0.32 in) across the face. Each weighs 0.40 grams.
- Round
- Size of each stone: 8.1 mm
- In inches: 0.32 in
- Princess
- Size of each stone: 6.9 x 6.9 mm
- In inches: 0.27 x 0.27 in
- Cushion
- Size of each stone: 7.1 x 7.1 mm
- In inches: 0.28 x 0.28 in
- Oval
- Size of each stone: 10.1 x 6.9 mm
- In inches: 0.40 x 0.27 in
- Pear
- Size of each stone: 10.7 x 6.9 mm
- In inches: 0.42 x 0.27 in
- Heart
- Size of each stone: 8.2 x 8.2 mm
- In inches: 0.32 x 0.32 in
4 ctw studs next to a coin
2 ct diamond
8.1 mm
US dime
17.9 mm
US nickel
21.2 mm
US quarter
24.3 mm
Nearby stud sizes
- 3 ctw
- Each stone: 1.5 ct
- Round size: 7.4 mm
- 4 ctw (this page)
- Each stone: 2 ct
- Round size: 8.1 mm
- 5 ctw
- Each stone: 2.5 ct
- Round size: 8.8 mm
How to compare studs from different sellers
Ask for the size in mm of each stone along with the total weight. Two pairs of the same ctw can differ by a few tenths of a millimeter because of the cut. See the stud earring size chart for every weight, or how to measure a diamond you already own.
Questions
Each round stone of a 4 ctw pair is about 8.1 mm across (0.32 in).
Two. ctw is the combined weight of the pair, so each stone is 2 carat.
Each stone is 8.1 mm across, 45% of the width of a US dime (17.91 mm). Round 2 carat stones are the same size whether they sit in a ring or an earring.
2 carat each.