Melee Diamond Size Chart: MM, Carat Weight & Sieve Conversion Guide

If you have ever tried to order melee for a pavé band or a halo setting, you already know the headache. One supplier quotes you in millimeters, another quotes carat weight, and a third throws a sieve number at you like you should just know what it means. This confusion is exactly why a reliable melee diamond size chart matters so much to anyone buying in bulk, whether you are a jewellery manufacturer, a retailer, or a sourcing manager trying to match stones across a production run.

This guide is meant to work as a practical melee diamond sizing guide you can bookmark and return to every time you place an order. We will walk through the melee diamond size chart mm breakdown, how melee diamond mm to carat conversion actually works, the sieve system used across Mumbai and Surat, and how many stones make up a carat depending on size. By the end, you should be able to read a supplier’s quote in seconds instead of guessing.

What Exactly Is a Melee Diamond?

The word melee comes from the French term for “mixed” or “medley,” and that origin says a lot about how these stones are traded. Rather than being certified and sold one by one like a solitaire, melee diamonds move through the market in parcels, sorted by size rather than individually graded.

According to the Gemological Institute of America, melee diamonds are generally diamonds weighing less than 0.20 carats, which works out to roughly 3.75mm in diameter or smaller. In day to day trade language, especially in India, the term is often used more narrowly for stones under 0.15 carats, or about 3.5mm. Within that range, the trade splits melee into rough tiers:

• Stars, the smallest category, running from about 0.009 to 0.021 carats (roughly 1.2mm to 1.7mm)
• Fulls, sitting between 0.02 and 0.07 carats (about 1.7mm to 2.6mm)
• Pointers, the largest melee tier, from 0.08 to 0.20 carats (around 2.7mm to 3.75mm)

Knowing these bands helps a lot when you are trying to figure out melee diamond sizes for a specific design brief, since a halo ring and a pavé shank often call for stones from different tiers.

Melee Diamond Size Chart: MM to Carat

This is the table most people are actually looking for. Below is a melee diamond size chart mm to carat breakdown for round brilliant melee, covering the sizes used most often in halo rings, pavé settings, and eternity bands.

Treat this as a working melee diamond carat size chart rather than an exact science. Because carat weight depends on depth as well as diameter, two stones cut at the same mm size can differ slightly in weight if one has a shallower or deeper pavilion. This is why a good melee diamond size chart carat reference always shows a small range rather than one fixed number per mm size.

How the Melee Diamond MM to Carat Conversion Actually Works

A round diamond’s carat weight is tied to its volume, and volume grows with the cube of the diameter, not in a straight line. That is why the jump from 1mm to 2mm in diameter does not just double the carat weight, it multiplies it by roughly eight. This is the core idea behind any melee diamond mm to carat chart, and it is also why eyeballing size differences on a ring can be deceiving. A 3mm stone looks only a little bigger than a 2mm stone, but it can weigh more than three times as much.

For quick mental math, jewellers in the trade often use this rough rule: a 1mm round diamond weighs about 0.005 carats, meaning roughly 200 of them add up to one carat. This single reference point is often enough to sanity check a melee diamond carat to mm conversion without pulling out a full chart.

Melee Diamond Sieve Size Chart

Millimeters and carats are only half the story. In the trade, especially across Mumbai and Surat, stones are physically sorted using metal plates with precisely drilled holes, known as sieves. A parcel is poured onto a stack of sieves, and gravity does the sorting: stones that cannot pass through a given hole size stay on that plate, while smaller stones fall through to the next one. This is the fastest way to grade thousands of tiny stones without weighing each one by hand, and it is the backbone of every melee diamond sieve size chart used in the industry.

Here is a simplified melee diamond sieve chart showing how sieve numbers line up with mm size and carat weight for round melee:

Sieve sets typically run from 000 up through +16, covering everything from the tiniest star melee to the larger pointer sizes right before a stone would be individually graded. If you need to go the other direction, converting a melee diamond sieve to mm is just a matter of reading the range printed on the plate itself, since each sieve is stamped with its aperture size.

Because sieve grading is a physical, mechanical process rather than a laser measurement, a melee diamond mm to sieve match will always carry a small tolerance. That tolerance is normal and accepted across the trade, but it is worth knowing about if you need extremely tight size uniformity for a piece like a straight-line pavé band.

Melee Diamond Weight Chart and Stones Per Carat

One of the most practical numbers in this whole conversation is stones per carat, because it directly affects your ordering quantities and your cost calculations. A melee diamond weight chart paired with a stones per carat column tells you exactly how many individual stones you are getting in a parcel of a given carat weight.

Some quick reference points worth memorizing:

• At 1mm, you are looking at roughly 200 to 250 melee diamonds per carat
• At 1.5mm, that number drops to around 65 to 75 stones per carat
• At 2mm, you are down to about 29 to 32 stones per carat
• At 3mm, only around 10 stones make up a full carat

This is the kind of melee diamond stones per carat logic that setters and production planners use to estimate exactly how much material a design will consume before placing an order, which saves a lot of back and forth with suppliers later.

Round Melee Diamond Size Chart vs. Other Small Diamonds

Most of the demand in this category is for round brilliant cuts, which is why a round melee diamond size chart is the most requested version of this table. Round melee is the default choice for halo settings, pavé shanks, and channel work because the shape sits flush and reflects light consistently regardless of orientation. If your design calls specifically for round goods, it is worth browsing our natural round diamonds range to see how sizing and quality tiers are organised in practice.

That said, “melee” is not exclusively round. Baguette, princess, and marquise melee exist too, and their small diamond size chart values do not line up one to one with round stones of the same carat weight, since the shapes distribute weight differently across their surface area. If a design calls for a mix of shapes, it is worth asking your supplier for a shape-specific small diamond mm to carat breakdown rather than assuming the round chart applies across the board.

How to Measure Melee Diamonds

If you are working without a certificate or a supplier’s spec sheet, here is a straightforward way to check sizing yourself.

1. Use a diamond gauge or digital caliper to measure the diameter across the widest point of the stone. This gives you the raw mm figure to cross reference against a chart.
2. Run the parcel through a sieve set if you are handling a bulk lot. This is faster than measuring stone by stone and is the industry standard for sorting large quantities.
3. Weigh a small sample on a carat scale and divide by the stone count to get an average weight per stone, which you can then cross check against the mm reading.

Combining these two or three checks is really how professionals settle how to measure melee diamonds accurately, since relying on just one method can hide small inconsistencies within a parcel.

How to Choose the Right Melee Diamond Size

Picking the right size comes down to the piece you are building and the visual weight you want it to carry.

• For delicate pavé work on thin bands, sizes between 1mm and 1.5mm usually look the most proportionate.
• For halo settings around a center stone, 1.5mm to 2mm melee tends to strike the right balance between sparkle and subtlety.
• For statement pieces or larger clusters, sizes from 2.5mm upward start to read as individually noticeable stones rather than background sparkle.

Getting melee diamond size conversion right at the design stage, before you place a bulk order, avoids the costly problem of receiving stones that are technically correct on paper but look wrong once they are actually set.

Natural vs. Lab Grown Melee Diamonds

Buyers today have a genuine choice between natural melee diamonds and lab grown melee diamonds, and the size and sieve charts above apply equally to both. The physical and optical properties of lab grown diamonds are identical to natural stones of the same size, so a 1.5mm lab grown round will convert to carat weight the same way a natural 1.5mm round does. If cost efficiency for a production run is the priority, our lab grown diamonds collection is worth a look before you finalise quantities.

The real difference comes down to origin, certification, and price point. Natural melee still holds strong demand for higher end and bridal collections where provenance is part of the value proposition, while lab grown melee has become popular for volume work where cost per carat matters more.

Why Source Melee Diamonds from a Trusted Wholesale Supplier

India cuts and polishes the overwhelming majority of the world’s melee, with Surat alone accounting for the bulk of global production, and Mumbai serving as one of the key trading and export hubs for finished parcels. This concentration of skill and scale is exactly why so many manufacturers and retailers look for a melee diamond supplier in India rather than sourcing smaller, inconsistent lots elsewhere. We work as a melee diamond supplier in Mumbai out of the Bharat Diamond Bourse, which keeps sieve grading consistent across repeat orders instead of varying lot to lot.

Consistency matters just as much as location when you are buying wholesale melee diamonds, since a mismatch of even half a millimeter across a parcel shows up clearly once stones are set side by side. Beyond melee alone, our loose diamonds collection covers both natural and lab grown options for center stones, so you can source everything for a single design under one roof.

If you are still comparing melee diamond supplier options, ask each one for their sieve tolerance and their loose melee diamonds minimum order quantity before committing, since these two details usually reveal how organised their sorting process actually is.

Frequently Asked Questions

What size is considered a melee diamond?
Anything under roughly 0.20 carats, or about 3.75mm in diameter, falls under the GIA’s melee classification. In trade practice, the term is often used more strictly for stones under 0.15 carats.

How many melee diamonds make one carat?
It depends entirely on the size. A 1mm stone runs about 200 to a carat, while a 2mm stone only takes around 29 to 32 stones to reach the same weight.

What is a diamond sieve size chart used for?
It is used to physically sort large parcels of melee by passing them through metal plates with graduated hole sizes, which groups stones of similar diameter together for consistent pricing and setting.

Is there a difference between natural and lab grown melee sizing?
No. Size and carat conversion work identically for both, since lab grown diamonds share the same physical structure as natural ones.

Why do mm to carat conversions vary slightly between charts?
Carat weight depends on cut depth as well as diameter, so two stones of the same mm size can weigh slightly differently depending on how they were cut.

If you are ready to place an order or just want a sieve chart matched to your exact design, get in touch with our team and we can walk you through current parcel availability.