Is Your Diamond Rare? A Guide to Value in Mined and Lab-Grown Gems

Diamonds really were scarce once. For centuries, gem diamonds came in small numbers from riverbeds in India and, from the 1700s, Brazil. That changed in the late 1860s and 1870s, when large deposits were found in South Africa and the challenge for mine owners became too many diamonds rather than too few. By the late 1880s the major South African mines had been consolidated under one company, De Beers, and controlling how many stones reached the market became the business model.

For much of the twentieth century, De Beers sold most of the world’s rough diamonds through a single channel, the Central Selling Organisation. Producers had strong commercial reasons to sell through it, and De Beers sorted, valued, and released stones in quantities meant to keep prices steady.

When demand softened, more stones were held back. When demand was strong, more were released. As a result, diamond prices were far steadier than those of most commodities, which rise and fall with supply and demand.

That system began to loosen in the 1990s and 2000s, as major mines in Australia, Canada, and Russia sold more of their output through their own channels. In the early 2000s De Beers moved away from its role as the market’s stockpiler and refocused on its own production and brand. It remains one of the largest producers today, but it no longer controls supply for the whole market.

That era is where the idea of diamond rarity took hold. Managed supply, together with decades of famously effective advertising, taught buyers to think of every diamond as rare. Prices formed over those decades do not reset overnight, and the idea has outlasted the system that created it.

Lab-grown diamonds add a new layer to the rarity question, and it deserves a straight answer.

Lab-grown diamonds are not rare. They are grown under controlled conditions that can be reproduced again and again, so supply depends on production capacity, which can expand, rather than on what lies in the ground. There is no geological lottery, no finite deposit, and no remote mine involved.

That is not a criticism. It is simply how they differ from natural diamonds, and it is a big part of why a lab-grown diamond costs less than a natural diamond of the same size and quality. If you want the most beautiful stone your budget allows, that works in your favor.

Lab-grown and natural diamonds share the same chemistry, hardness, brilliance, and fire, and they look the same on the hand. Independent labs such as IGI grade both on the same 4Cs. The difference is origin and supply, not the experience of wearing the stone.

What a lab-grown diamond does not carry is the rarity premium of a natural stone. Its price mainly reflects what it takes to grow, cut, and polish it, and its quality.

Rarity is one input into value, but it is not the only one, and it is not always the most important. Seeing how the pieces fit together helps you understand what you are paying for with any diamond.

Rarity creates value only when it meets desire. Something extremely scarce that nobody wants has little market value, while something moderately scarce that many people want can be worth a great deal. For decades the diamond trade benefited from both: carefully managed supply on one side, and on the other, a remarkably successful advertising effort built around the line “A Diamond Is Forever,” written for De Beers in 1947.

Beauty and durability add value on their own. A diamond’s brilliance and hardness are physical facts, not marketing, and people treasure them whether a stone is common or rare.

So does meaning. The significance generations of couples have attached to a diamond engagement ring is genuine, even though advertising helped shape it.

Put together, the price of a natural colorless diamond reflects a degree of real geological scarcity, the costs of mining and cutting, a cultural premium, and pricing habits formed during the era of managed supply. Knowing that is not a reason to avoid natural diamonds. It simply tells you what you are paying for, which is exactly what you need to make a choice you feel good about.

Lasting value is not about resale. Most diamonds, natural or lab-grown, resell for well below their retail price, so we encourage you not to think of an engagement ring as a financial investment. Lasting value comes from a stone you can trust, a cut that keeps it beautiful, and a ring you will still love decades from now.

Insist on an Independent Grading Report

A report from an independent lab documents what you are buying: whether the stone is natural or lab-grown, its carat weight, color, and clarity, and details of its cut. Every Mine & Grown center stone comes with an IGI or GIA grading report.

Put Cut First

Cut is what brings a diamond to life. On a round diamond, look for an excellent or ideal cut grade; other shapes usually do not receive an overall cut grade, so look closely at polish, symmetry, and how the stone handles light. Then balance color, clarity, and carat to suit your budget. A beautifully cut stone with modest specifications will usually outshine a poorly cut one with impressive numbers.

Look for a Setting Made to Be Worn

A diamond is only as secure as the setting that holds it. Our rings are handcrafted in our Chicago studio and backed by a 3-year warranty covering manufacturing flaws, because a ring is meant for everyday life, not just the proposal.

Choose the Diamond You Love

The diamond that holds its value for you is the one you are happy to look at every day. Natural or lab-grown, classic or unexpected, choose what you and your partner love rather than what someone tells you is rare. If you would like a second opinion, our team is glad to walk you through options by video or phone.