Diamond Size Chart

Our diamond size chart

We have an extensive range of diamond sizes at David Rodger Sharp so we're confident that we have the right one for you or that special person. Pay us a visit in Henley-on-Thames and see what we have to offer at David Rodger Sharp Jewellers.

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Round

Round MM Size	Round Carat Weight	Round MM Size	Round Carat Weight	Round MM Size	Round Carat Weight
0.8mm	0.0025 ct.	4.5mm	0.36 ct.	9.1mm	3 ct.
1mm	0.005 ct.	4.75mm	0.44 ct.	9.5mm	3.35 ct.
1.1mm	0.0067 ct.	5mm	0.5 ct.	9.75mm	3.61 ct.
1.2mm	0.009 ct.	5.25mm	0.56 ct.	10mm	3.87 ct.
1.25mm	0.01 ct.	5.5mm	0.66 ct.	10.25mm	4.16 ct.
1.3mm	0.01 ct.	5.75mm	0.75 ct.	10.5mm	4.41 ct.
1.5mm	0.015 ct.	6mm	0.84 ct.	10.75mm	4.57 ct.
1.75mm	0.02 ct.	6.25mm	0.93 ct.	11mm	4.91 ct.
1.8mm	0.025 ct.	6.25mm	1 ct.	11.25mm	5.49 ct.
2mm	0.03 ct.	6.8mm	1.25 ct.	11.5mm	5.85 ct.
2.2mm	0.04 ct.	7mm	1.3 ct.	12mm	6.84 ct.
2.5mm	0.06 ct.	7.3mm	1.5 ct.	12.25mm	7.26 ct.
2.75mm	0.08 ct.	7.5mm	1.67 ct.	12.5mm	7.36 ct.
3mm	0.10 ct.	7.75mm	2 ct.	12.75mm	7.52 ct.
3.25mm	0.14 ct.	8mm	2.11 ct.	13mm	8.51 ct.
3.5mm	0.17 ct.	8.25mm	2.43 ct.	13.5mm	9.53 ct.
3.75mm	0.21 ct.	8.5mm	2.5 ct.	14mm	10.49 ct.
4mm	0.25 ct.	8.7mm	2.75 ct.	15mm	12.89 ct.
4.25mm	0.28 ct.	9mm	3 ct.	16mm	16.06 ct.

Emerald

Emerald MM size	Emerald Carat Weight	Emerald MM size	Emerald Carat Weight
3x2mm	0.1 ct.	9x7mm	2.5 ct.
3.5x2mm	0.12 ct.	10.x7.5mm	3 ct.
4x2mm	0.15 ct.	9.5x7.5mm	3.21 ct.
4x3mm	0.2 ct.	10x8mm	3.79 ct.
5x3mm	0.29 ct.	11x9mm	5.21 ct.
5.5x3.5mm	0.46 ct.	12x8mm	5.34 ct.
6x4mm	0.5 ct.	12x10mm	6 ct.
6.5x4.5mm	0.75 ct.	14x8mm	6.25 ct.
6.7x4.5mm	0.88 ct.	13x9mm	6.38 ct.
7x5mm	1 ct.	14x10mm	8.48 ct.
7.3x5.3mm	1.25 ct.	13x11mm	9.13 ct.
7.5x5.5mm	1.5 ct.	14x12mm	11.26 ct.
8x6mm	1.75 ct.	16x12mm	14.22 ct.
8.5x6.5mm	2 ct.

Princess

Princess MM Size	Princess Carat Weight	Princess MM Size	Princess Carat Weight
1.5mm	0.015 ct.	6.75mm	1.75 ct.
1.75mm	0.03 ct.	7mm	2 ct.
2mm	0.06 ct.	7.25mm	2.01 ct.
2.25mm	0.08 ct.	7.5mm	2.5 ct.
2.5mm	0.1 ct.	7.75mm	2.74 ct.
2.75mm	0.13 ct.	8mm	3 ct.
3mm	0.18 ct.	8.25mm	3.24 ct.
3.25mm	0.26 ct.	8.5mm	3.67 ct.
3.5mm	0.29 ct.	8.75mm	4.1 ct.
3.75mm	0.31 ct.	9mm	4.12 ct.
4mm	0.39 ct.	9.5mm	5.09 ct.
4.25mm	0.44 ct.	9.75mm	5.36 ct.
4.5mm	0.5 ct.	10mm	5.62 ct.
4.75mm	0.64 ct.	10.25mm	5.76 ct.
5mm	0.75 ct.	10.5mm	5.99 ct.
5.25mm	0.9 ct.	11mm	7.44 ct.
5.5mm	1 ct.	11.5mm	9.44 ct.
5.75mm	1.11 ct.	12mm	9.52 ct.
6mm	1.25 ct.
6.25mm	1.39 ct.
6.5mm	1.5 ct.

Oval

Oval MM Size	Oval Carat Weight	Oval MM Size	Oval Carat Weight
4.5x3.5mm	0.21 ct.	10x8mm	2.5 ct.
5x3mm	0.21 ct.	10.5x8.5mm	2.88 ct.
5.5x3.5mm	0.33 ct.	12x8mm	3 ct.
5x4mm	0.35 ct.	11x9mm	3.85 ct.
6x4mm	0.5 ct.	12x10mm	5.05 ct.
6x5mm	0.61 ct.	14x10mm	5.81 ct.
6.5x4.5mm	0.65 ct.	13x11mm	6.05 ct.
7x5mm	0.75 ct.	14x12mm	8.21 ct.
7.7x5.7mm	1 ct.	15x12mm	8.76 ct.
8x6mm	1.25 ct.	16x12mm	9.32 ct.
9x6mm	1.41 ct.	16x14mm	11.88 ct.
8.5x6.5mm	1.5 ct.	18x13mm	12.86 ct.
9x7mm	2 ct.	20x15mm	14.96 ct.

Pear

Pear MM Size	Pear Carat Weight	Pear MM Size	Pear Carat Weight
3x2mm	0.13 ct.	12x8mm	3 ct.
4x2.5mm	0.18 ct.	12x7mm	3.12 ct.
4x3mm	0.21 ct.	12x9mm	3.44 ct.
5x3mm	0.25 ct.	14x8mm	3.47 ct.
5x4mm	0.35 ct.	13x9mm	4.11 ct.
6x4mm	0.5 ct.	14x9mm	4.25 ct.
6.5x4.5mm	0.6 ct.	15x9mm	5.06 ct.
7x5mm	0.75 ct.	14x10mm	5.41 ct.
7.5x5.5mm	0.85 ct.	13x11mm	5.65 ct.
7.7x5.7mm	1 ct.	15x10mm	5.75 ct.
8x6mm	1.25 ct.	16x9mm	5.86 ct.
8.5x6.5mm	1.5 ct.	16x10mm	6.27 ct.
10x6mm	1.71 ct.	17x10mm	6.46 ct.
8.7x6.7mm	1.8 ct.	15x11mm	7.36 ct.
9x7mm	2 ct.	18x11mm	8.14 ct.
10x8mm	2.5 ct.	16x12mm	8.99 ct.
11x7.5mm	2.61 ct.	18x12mm	9.35 ct.
13x8mm	2.98 ct.	18x12mm	10.21 ct.
11x8mm	3 ct.

Marquise

Marquise MM Size	Marquise Carat Weight	Marquise MM Size	Marquise Carat Weight
3x1.5mm	0.025 ct.	9.5x4.7mm	0.85 ct.
3.5x1.75mm	0.065 ct.	10x5mm	1 ct.
3.5x2mm	0.07 ct.	11x5.5mm	1.25 ct.
4x2mm	0.1 ct.	11.5x6mm	1.33 ct.
3.75x1.75mm	0.11 ct.	12x6mm	1.5 ct.
4.25x2.25mm	0.12 ct.	13x6.5mm	2 ct.
5x2.5mm	0.14 ct.	14x7mm	2.5 ct.
5.5x2.75mm	0.16 ct.	15x7mm	3 ct.
5.5x3mm	0.18 ct.	14x8mm	3 ct.
5x3mm	0.2 ct.	15x7.5mm	3.25 ct.
6.5x3mm	0.23 ct.	15x8mm	3.44 ct.
6x3mm	0.25 ct.	16x8mm	3.86 ct.
7x3mm	0.3 ct.	16.5x8.25mm	4 ct.
7.5x3.5mm	0.33 ct.	17x8.5mm	4.88 ct.
7x4mm	0.34 ct.	17.5x10mm	5.5 ct.
8x4mm	0.5 ct.	20x8mm	7.08 ct.
8.75x4.25mm	0.7 ct.	20x10mm	7.94 ct.
9x4.5mm	0.75 ct.	20x11mm	9.5 ct.