Diamond size chart at actual size: print at 100%

By HeyGema™ · Updated

In short

Print this page at 100% and each circle is the real diameter of a round diamond of that weight, from 2.99 mm for 0.1 carat to 13.9 mm for 10 carat. A bank card box and a ruler at the bottom check the scale.

In the print window, choose Scale: 100% (or Actual size) and turn off Fit to page.
Diamond size chart at actual sizeRound brilliant, well cut. Print at 100% (no fit to page); check the box and ruler at the bottom.0.1 ct3.0 mm0.15 ct3.4 mm0.2 ct3.8 mm0.25 ct4.1 mm0.3 ct4.3 mm0.4 ct4.8 mm0.5 ct5.1 mm0.6 ct5.4 mm0.75 ct5.9 mm0.8 ct6.0 mm0.9 ct6.2 mm1 ct6.5 mm1.25 ct6.9 mm1.5 ct7.4 mm1.75 ct7.8 mm2 ct8.1 mm2.5 ct8.8 mm3 ct9.3 mm3.5 ct9.8 mm4 ct10.2 mm5 ct11.0 mm6 ct11.7 mm8 ct12.9 mm10 ct13.9 mmOther shapes: 1 carat (filled) and 2 carat (outer outline)Oval1 ct 8.0 x 5.5 · 2 ct 10.1 x 6.9Cushion1 ct 5.6 x 5.6 · 2 ct 7.1 x 7.1Princess1 ct 5.5 x 5.5 · 2 ct 6.9 x 6.9Emerald cut1 ct 7.0 x 5.0 · 2 ct 8.8 x 6.3Asscher1 ct 5.5 x 5.5 · 2 ct 6.9 x 6.9Radiant1 ct 6.5 x 5.0 · 2 ct 8.2 x 6.3Pear1 ct 8.5 x 5.5 · 2 ct 10.7 x 6.9Marquise1 ct 10.4 x 5.2 · 2 ct 13.1 x 6.6Heart1 ct 6.5 x 6.5 · 2 ct 8.2 x 8.2Trillion1 ct 7.0 x 7.0 · 2 ct 8.8 x 8.8Baguette1 ct 8.0 x 4.0 · 2 ct 10.1 x 5.0Check the scaleBank card size: 85.6 x 54 mmLay a bank card on this box. If it fits, the chart is at actual size.0102030405060708090Ruler, 0 to 90 mmheygema.com/gem-size

How to print it at actual size

  1. 1

    Open the print dialog

    Choose Print on this page, or open the PDF.

  2. 2

    Set the scale to 100%

    Turn off Fit to page, Shrink to fit and Scale to fit. Margins can stay default.

  3. 3

    Check the scale

    Lay a bank card on the box at the bottom. If its edges meet the box, every stone is at actual size. The ruler beside it should measure 90 mm from 0 to 90 against a real ruler.

  4. 4

    Compare

    Place a loose stone or the stone in your ring on the matching circle, or measure your ring's stone with a ruler and read the carat across.

What the chart shows

Each round diamond is drawn at the diameter of a well-cut stone of that weight. The other shapes show a 1 carat stone and, as an outer outline, a 2 carat stone. A stone mounted in a ring is seen from above, so measure across the top of the stone, not the prongs.

Questions

Print at 100% with Fit to page turned off, then check the bank card box. If the card fits the box, the stones are life-size.
The drawings are exact at 100%. The sizes are for a well-cut stone of each weight; a deeper or shallower cut measures a little smaller or larger for the same weight.
Measure the stone's diameter in mm and find the nearest circle. For other shapes use the mm to carat calculator.

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