Old cut diamonds vs round brilliants… what’s the difference?

old cut diamonds vs round brilliants

Anyone who has shopped for a diamond is probably familiar with the ‘4Cs‘. While many people focus on a combination of colour, clarity and carat weight, the fourth ‘C’, how a diamond is cut, is a widely undervalued yet crucial factor influencing a diamond’s beauty.

Cut pertains to so much more than a diamond’s shape. Even when comparing diamonds of the same shape, their symmetry, proportions, polish, number of facets and the proportions of these facets have a profound effect on how well each diamond reflects light. These same attributes are what separates old cut diamonds from their modern counterpart, the round brilliant cut.

So, old cut diamonds vs round brilliants… what’s the difference?


A brief history of old cut diamonds

The late 1800s  brought significant advances in the art of diamond cutting. The crude cutting techniques that produced rose cut diamonds evolved into more refined techniques that resulted in what we now call ‘old cut’ diamonds. These newer techniques used steam-driven and motorised tools that enabled cutters to shape diamonds more precisely. During this period, changes to the number, placement and proportions of facets resulted in diamonds that were more brilliant than had ever been seen before.

Old cut diamonds are recognisable by their round outline, fair symmetry, high crown, small table, circular girdle, large facets and in many cases, a flat and polished culet. They also tend towards deeply cut proportions, making them appear thicker than round brilliant cuts.

When comparing old cut diamonds vs round brilliants, it’s important to note that round brilliants are cut in such a way that light enters the diamond and bounces right back out. This produces the brilliant white sparkle effect that most people associate with diamonds. The sparkle of old cut diamonds is deeper and warmer, almost glowing in a way that draws the eye into the stone instead of bouncing the light back out. This makes old cut diamonds star performers in candlelight and other low light settings.

Casual observers might not be able to immediately distinguish old cut diamonds vs round brilliants, so let’s take a look at five key characteristics of old cut diamonds vs. round brilliants.


Five characteristics of old cut diamonds vs round brilliants


Old European Cut Diamond

HRD certified 3.03ct old European cut diamond.

When viewed from the top, an old cut diamond will be nearly perfectly round, just like a modern round brilliant cut. The invention of steam-driven and electric cutting equipment in the late 1800s finally made it possible to cut round diamonds on an industrial scale.


Old cut diamonds usually have a small table or top facet. The crown, which is the portion of the stone above its widest point, is generally taller than what we see on modern brilliant cut stones. The pavilion depth, which is the portion of the stone below its widest point, is generally deeper than what we see on modern brilliant cuts. However, when comparing these elements across different stones, it’s important to compare stones of a similar size in order to get an accurate picture.

Number of Facets

round brilliant cut diamond

GIA certified 1.52ct round brilliant cut diamond.

Old cut diamonds have 58 facets. Most round brilliant cuts only have 57 due to the fact that most have a pointed culet (see below). While old cut diamonds were cut with an emphasis on maximising their size and enhancing their colour and clarity, round brilliant cut diamonds are cut to maximise their brilliance (hence the name) or the amount of white light that’s reflected internally and externally from the stone.

Faceting and Cutting

One of the things that many people love about old cut diamonds vs round brilliants is that fact that they were cut by hand. Romantics are drawn to the idea of a craftsman at his workbench hand-cutting their stone over a century ago. This legacy is evident as a close look at any old cut diamond will quickly reveal that its facets are bigger and less uniformly-shaped than those of a modern brilliant cut stone. Each stone has its own recognisable sparkle due to the shape, size and placement of its facets.


 Again, because old cut diamonds were hand-cut, they’ll lack the symmetrical precision that we’ve come to expect in modern cuts. It’s not unusual, in fact it’s quite common, for an old cut diamond to have some irregularities in the shape and alignment of its facets.

A Culet

Due to advances in diamond cutting techniques, most modern diamonds have a pointed tip at the bottom, which reflects any light entering the stone. Due to the cutting techniques used to produce old cut diamonds, the pavilion facets are rarely uniformly cut and at the proper angle. This means that old cut diamonds rarely end in a perfect point. Instead, they end with an open culet that may be rough or polished. Diamond cutters at this time believed that the culet let more light into the stone, thereby increasing its brilliance.

To people unfamiliar with old cut diamonds, the culet, which appears as dark circle, can be mistaken for a hole or an inclusion. However, it’s actually the 58th facet and one of the most easily-recognised attributes of old cut diamonds vs round brilliants.


Victorian Three Stone 2.10 Carat Old Cut Diamond Ring, c.1881

Handmade Victorian era three stone diamond ring, engraved ‘F.C.J. Oct 1881’.

Old cut diamonds in antique and vintage jewellery

Old cut diamonds were the prevailing style from the 1890s up until the 1930s. They figure prominently as the principal stones in pieces from the Victorian, Edwardian and Art Deco periods.

Old cut diamonds, especially in larger carat weights, are becoming increasingly rare. Many of these stones have been re-cut into round brilliants, which some people believe improves their proportions and how the diamond interacts with light, thereby increasing its value. With this in mind, a Victorian era engagement ring like this one dating from the 1880s and featuring an EDR certified, VS1 clarity, 2.83 carat, old cut diamond is a unique and increasingly rare piece to behold.

Art Deco Coral, Onyx and Diamond Brooch, c.1920s

This original and quintessentially Art Deco brooch dating from the 1920s combines baguette and old cut diamonds with coral and onyx.

The Edwardian era produced beautiful dinner rings, like this one, featuring a triple cluster of old cut diamonds in an elegant and sophisticated style that can still be worn today.

Platinum and diamonds ruled the kingdom of Art Deco jewels! In this elaborate diamond cluster ring dating from the 1920s, three old cut diamonds are joined by eight cuts and emerald cuts to stunning effect. The Jazz Age also produced this ornate Art Deco era ring in which trillion cut emeralds accent five old cut diamonds set in platinum.

Old cut diamonds were prevalent through the end of the Art Deco era in pieces like this 1.70 carat diamond cluster ring, which dates from the 1930s. The end of the 1930s brought transitional cut diamonds, which eventually evolved into the round brilliant cuts that we commonly see today.


Choosing old cut diamonds vs round brilliants

When weighing the pros and cons of old cut diamonds vs round brilliants, it’s important to remember that despite their similarities, they’re two completely different types of stones.

Old cut diamonds predate the discovery of the most productive African mines, which produce the highest quality diamonds in the world. At the time these antique stones were cut, there were far fewer diamonds available and cutters were generally working with lesser quality stones than are available today. Diamonds at this time were cut with a focus on maximising their carat weight, and often their colour and clarity, often at the expense of their brilliance. A hand-cut stone will never match the precision of a machine cut stone, but that’s part of their unique charm. Old cut diamonds must be held to a different standard than modern cuts, and while a certified stone is more desirable to some buyers than an uncertified stone, it’s important to remember that old cut diamonds are often unfairly penalised by certifying organisations because they’re graded against modern standards.

Modern diamonds, regardless of their shape, are available in an almost unlimited supply of virtually any combination of specifications and pricepoints that you can imagine. On the other hand, old cut diamonds are dwindling in supply, and concessions will most likely have to be made regarding some of the 4Cs. For many, this is a sacrifice well worth making for the opportunity to own a one of a kind piece with history.

When shopping for an old cut diamond, or a modern round brilliant cut, the most important thing is to choose one that you love!