Diamond actual size on screen: see any carat at real size
By HeyGema™ · Updated
In short
A screen shows a millimeter at a different size on every device, so a picture is only actual size once the screen is calibrated. Hold a bank card against the screen once, and every stone here is drawn at its real size, for example 6.5 mm for a 1 carat round diamond.
Diamond actual size on your screen
1 ct diamond round: 6.5 mm. Calibrate once below to show it at actual size.
Why calibrate
Phones, tablets and monitors pack pixels at very different densities, and the browser cannot read the true size of the screen. Matching the box on the screen to a bank card (54 mm on its short side) or a US quarter (24.26 mm) tells the page how many pixels make a millimeter. It is saved in your browser, so the other size pages use it too. Set browser zoom to 100% first.
Round diamonds at actual size
- 0.25 carat
- Diameter: 4.1 mm
- Inches: 0.16 in
- 0.5 carat
- Diameter: 5.1 mm
- Inches: 0.20 in
- 0.75 carat
- Diameter: 5.9 mm
- Inches: 0.23 in
- 1 carat
- Diameter: 6.5 mm
- Inches: 0.25 in
- 1.5 carat
- Diameter: 7.4 mm
- Inches: 0.29 in
- 2 carat
- Diameter: 8.1 mm
- Inches: 0.32 in
- 3 carat
- Diameter: 9.3 mm
- Inches: 0.37 in
- 4 carat
- Diameter: 10.2 mm
- Inches: 0.40 in
- 5 carat
- Diameter: 11.0 mm
- Inches: 0.43 in
No screen handy: print it
Print the actual size diamond chart at 100% and lay a stone or a ring on it. It has a bank card box and a ruler to check the scale.