Free tool

Gem and metal weight of a ring

Q: How does the studio weigh a ring?

Design Facts measures the metal's volume from the mesh and weighs it in the part's alloy, and counts every stone with its shape, size and estimated carat from its own volume and specific gravity. The figures here use simple shapes; the studio's come from the real design.

Weigh a ring's metal in grams and its stones in carats together, the way Design Facts reports a design in the studio, and look up what accent and pavé stones weigh by size.

A 2 × 1.6 mm D-shape band at US 6.5 with a 6.5 mm round centre stone and 18 pavé stones of 1.3 mm: 18k yellow gold · 2.24 g · 19 stones · 1.17 ct.

As Design Facts writes it

18k yellow gold · 2.24 g · 19 stones · 1.17 ct

Metal of the band: 2.24 g
Centre stone: 1.02 ct · 6.50 mm
Side stones: 18 × 0.008 ct = 0.15 ct
All stones: 1.17 ct
Stones in grams: 0.23 g
On a scale, set: 2.47 g

The band as a plain ring; a head, prongs or a gallery add metal. Stones from the trade's formulas in their usual proportions, at Design Facts' specific gravities.

Accent and pavé stones: size to carat

Round brilliant diamonds from 0.8 to 3 mm, the sizes set as pavé, halos and accents, with how many make a carat. Coloured stones of the same size weigh more or less, by their specific gravity.

Small round diamond sizes in mm with carat weight
Diameter mm	Carat each ct	Stones in 1 ct
0.8	0.002	525
0.9	0.003	369
1.0	0.004	269
1.1	0.005	202
1.2	0.006	156
1.3	0.008	122
1.4	0.010	98
1.5	0.013	80
1.6	0.015	66
1.7	0.018	55
1.8	0.022	46
1.9	0.026	39
2.0	0.030	34
2.1	0.034	29
2.2	0.040	25
2.3	0.045	22
2.4	0.051	19
2.5	0.058	17
2.6	0.065	15
2.7	0.073	14
2.8	0.082	12
2.9	0.091	11
3.0	0.10	10

Common rings, worked out

Plain bands at US 6.5 with diamonds, in the alloys jewellers quote. Seats and settings change the metal; the studio weighs the real design.

Metal and stone weight of common ring designs
Ring	14k gold g	18k yellow gold g	Platinum 950 g	Stones	Set, in 18k g
2 × 1.6 mm D-shape band, 6.5 mm round centre	1.89	2.24	3.09	1 · 1.02 ct	2.44
2.5 × 1.8 mm flat band, 7.4 mm round centre	3.47	4.10	5.66	1 · 1.51 ct	4.40
2 × 1.6 mm D-shape band, 6.5 mm round centre, 18 × 1.3 mm stones	1.89	2.24	3.09	19 · 1.17 ct	2.47
2.5 × 1.8 mm D-shape band, 11 × 2 mm stones	2.68	3.17	4.38	11 · 0.33 ct	3.24
3 × 1.8 mm D-shape band, 30 × 1.3 mm stones	3.22	3.81	5.26	30 · 0.25 ct	3.86

Common questions

How many grams of gold is a ring?

A plain 2 × 1.6 mm D-shape band at US 6.5 is 2.24 g in 18k yellow gold, 1.89 g in 14k and 3.09 g in platinum 950. A head, prongs or a gallery add metal on top: the studio weighs the whole design from its mesh. The metal weight calculator weighs any band in every alloy.

Do the stones count in a ring's weight?

Jewellers quote the metal in grams and the stones in carats. On a scale one carat is 0.2 g, so the 1.17 ct of stones in the example add 0.23 g, and the set ring weighs about 2.47 g.

How much does a pavé diamond weigh?

A 1.3 mm round is about 0.008 ct, so 18 of them make 0.15 ct. A 1 mm round is 0.004 ct and a 2 mm round 0.030 ct; the table above goes from 0.8 to 3 mm, and the stone size tool covers centre stones in every cut.

How does the studio weigh a ring?

Design Facts measures the metal's volume from the mesh and weighs it in the part's alloy, and counts every stone with its shape, size and estimated carat from its own volume and specific gravity. The figures here use simple shapes; the studio's come from the real design.

More free tools

No account, nothing to install. The help centre explains the studio itself.

Weigh your own design.

Open your 3DM, STL or GLB in Jart: Design Facts weighs the metal and counts the stones from the mesh, and you can render it photoreal.

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