When it comes to understanding melee, it’s worthwhile to take a look at a melee diamond size chart. To settle the age-old debate: size does matter. When it comes to diamonds, carat weight is important, but the physical measurements of a stone are critical. Professionals in the industry, such as jewelry designers and CAD designers think about diamonds in terms of their dimensions, that is in tenths and in hundredths of a millimeter (mm). Because of their small size, the impact on designs is critical and extremely important that we can accurately assess and size melee loose diamonds. One of the handiest tools of the trade is a melee diamond size chart. It allows for quick and easy conversion from mm to a carat, which can be a tremendous time-saver. 

Why a Melee Diamond Size Chart Is a Helpful Tool 

When consumers consider the size of diamonds, they typically do so in terms of “carats.” After all, it is one of the much-touted 4Cs that plays such a large role in diamond education. But carat is a measurement of weight not of dimension. Two diamonds of the same carat weight may appear very different depending on how that weight is distributed. For example, a round 1.00 cts diamond may not take up as much space in a ring or on the finger as a shallower, longer fancy shape.

Cut also comes into the equation. A poorly cut 1.30 carat stone, for instance, may appear to be the same size as a well-cut 1.00-carat diamond, as the former hides extra weight below the girdle. So, while carat weight can give us a good idea of the size of the diamond, it does not tell the whole story. And when it comes to diamonds, it is essential that professionals give their clientele that full picture. 

Gemologists and industry professionals need precise measurements, down to the hundredth decimal place. It’s important to understand when you're converting mm to weight these measurements on the chart below are based on Ideal Cut diamond melee. MM tolerance will vary based on the cut of the stone. Simply look at a melee diamond size chart for at-a-glance answers.

mm to Carat Conversion At-a-Glance 

The Gemological Institute of America, Inc. (GIA) defines diamond melee as small diamonds, either single cut or full cut, weighing less than 0.20 pts. This melee diamond size chart features the mm to carat conversion for diamonds starting at 0.0025 carats, or 0.8 mm. If you want a downloadable chart, click here.

mm

Carat

0.8

0.0025

1.0

0.005

1.1

0.0067

1.2

0.009

1.25

0.1

1.3

0.01

1.5

0.015

1.75

0.02

1.8

0.025

2.0

0.03

2.2

0.04

2.5

0.06

2.75

0.08

3.0

0.10

3.25

0.14

3.75

0.21*

*This last measurement is just outside GIA’s definition of melee, but it is useful to include for reference. 

Melee loose diamonds are, as you can see from this chart, quite small. But the impact they can have on pieces, the opportunities they provide to create the intricate, opulent designs that are sought-after by consumers, and the margin-increasing benefits they bring to the bottom line make these tiny stones big players in your business. 

Contact K. Rosengart and work with a team of GIA Certified diamond experts to elevate your offerings and profitability.