Are Diamonds a Good Investment? Mostly No — Here Is the Exception

Mostly, no.

That is the honest answer, and it comes from a house that sells investment diamonds for a living. The overwhelming majority of diamonds lose value from the moment they are bought and never recover it: engagement rings, lab-grown stones, small goods, anything without serious certification. If you came here hoping to be talked into a diamond purchase, we will disappoint you for most of this page.

The complete answer has a second half. A narrow band of stones, defined by hard, verifiable criteria, behaves differently and has done so for decades. Our business exists entirely inside that band. This page draws the line between the two as precisely as we can, because knowing where the line runs is worth more than any sales argument.

Why Most Diamonds Lose Value

Four failure modes account for nearly all diamond disappointment. Check any stone against them and you will know within minutes which side of the line it sits on.

The jewellery markup never comes back

A diamond ring from a retail jeweller is priced for the setting, the brand, the boutique, and the moment. None of that survives resale. The stone inside is usually commercial quality, and the second-hand market prices it accordingly, at a fraction of what was paid. This is where the folk wisdom "diamonds lose half their value when you walk out of the shop" comes from, and for jewellery it is broadly fair. A ring is a purchase for love. It should be enjoyed as one and never entered in a spreadsheet as an asset.

Lab-grown diamonds are a manufactured product

Wholesale lab-grown prices collapsed from roughly $4,000 per carat to around $150 as production scaled. The collapse was not bad luck; it was the predictable economics of a product that can be made in unlimited quantity at falling cost. Chemical identity with natural diamond is irrelevant here. Storage of value requires scarcity, and lab-grown stones have none. Buyers who were sold them "as an investment" hold the proof.

Small stones are not scarce

Nature produces sub-1-carat material in abundance. Whatever its colour and clarity, a 0.3-carat stone competes with effectively unlimited supply, and no certificate changes that. The scarcity argument for diamonds begins at 1 carat in top qualities and strengthens with size, which is also why prices scale so steeply with carat; the details are on our diamond prices page.

Without GIA certification, you own an opinion

Grading differences invisible to the naked eye move diamond prices by double-digit percentages. A stone graded softly by a lenient laboratory, or not at all, will be re-graded harshly by every future buyer. The GIA is the global reference standard; its report number is laser-inscribed on the stone and verifiable online. In our view a stone without a GIA certificate is not an investment diamond at any price.

The Resale Reality Nobody Should Skip

Even for stones that pass every test, selling has structural costs that must be named before buying, not discovered after.

The spread is real. Between buying and selling prices lies 10–15%, in less liquid qualities up to 20%. You start every holding period that far behind, and only years of holding recover it.

Selling takes months. There is no exchange and no sell button. A well-certified stone sells through the house that sold it, through dealer networks in hubs like Antwerp, Dubai, and Tel Aviv, or at auction for exceptional pieces. In our experience the realistic horizon is measured in months, not days. Diamonds are the wrong instrument for money you might need quickly, full stop.

Levels of trade matter. A private seller who walks into a shop meets a wholesale bid and experiences the full spread at once. Selling well means selling through the right channel with the right documentation. This is a market where how you sell changes what you receive.

Prices cycle. The average 1-carat natural diamond fell around 11% in 2025 before recovering to roughly $4,400–4,500 per carat by the first quarter of 2026. Our own index of top-quality stones peaked in 2022 and corrected for three years before stabilising in 2026. Anyone claiming diamonds do not fall is selling, not informing.

The Narrow Case That Works

Strip away everything above and a small, specific segment remains: natural stones of 1 carat and above, in the top colour and clarity windows (D–H colour, IF–VS clarity, Excellent cut), certified by the GIA. Perhaps the top 1–2% of the market. Three things are true of this segment that are not true of the rest.

Supply is shrinking, and verifiably so. Top-quality material was always a small fraction of mine output, no major new mine has replaced ageing production, and the Argyle mine, the source of most of the world's pink diamonds, closed in 2020. Fancy coloured stones, pinks above all, now trade against a closed supply: what exists is what will ever exist. This is scarcity of the same character as fine art, but with objective, laboratory-graded quality instead of taste.

Value holds through cycles. Our house index for top 1-carat qualities (2015 = 100) stands at 98 as of July 2026: appreciation through the 2000s, resilience through 2008–09, a 2022 peak, a correction, stabilisation. Around 2% compounded over two decades. Not growth — persistence. In 2025, the year the broad market average dropped 11%, this segment declined considerably less.

They do a job nothing else does. A $500,000 position in certified stones fits in a jacket pocket. The same value in gold, above $4,000 per ounce as of July 2026, weighs roughly four kilograms. No register records diamond ownership, no bank stands in the middle, and a GIA-certified stone is identifiable and priceable anywhere on earth. For wealth that needs to be dense, mobile, and private, there is no substitute. The full case is on our investment diamonds page.

Diamonds vs Gold, Honestly Scored

We sell both, and we recommend gold first to almost everyone. The comparison explains why, and where diamonds win anyway.

	Investment diamonds	Physical gold
Liquidity	Months; dealer networks	Hours; global spot market
Price transparency	Reference lists, per-stone pricing	Public spot price, to the second
Spread	10–15%, up to 20%	Low single digits
Divisibility	None; a stone is indivisible	Excellent; sell one coin at a time
Value density	Extreme: $500k fits in a pocket	Moderate: $500k weighs ~4 kg
Privacy	No register, no bank, goods not currency	High, but bulk complicates transport
Entry threshold	Sensible from ~$50,000	Any amount
Expertise required	High; GIA certificate essential	Low

Gold wins on liquidity, transparency, divisibility, and simplicity, which is why it should be the larger and earlier position. Diamonds win on exactly two counts, value density and discretion, and for a specific kind of client those two counts outweigh everything else. That client typically holds diamonds as 5–15% of tangible assets, next to gold and never instead of it. Clients converting out of crypto often do both in one structure: see buying diamonds with bitcoin and buying gold with crypto.

Our standing answer to "should I buy diamonds?" is usually: not yet. Buy gold first, build the foundation, then come back. A house that sends you away today is one you can trust with a larger decision later.

Who Should Not Buy Diamonds

We turn away inquiries that fit the following profiles, and we would rather write it here than say it awkwardly in a meeting:

• Anyone who may need the money within a few years. The spread and the selling horizon make short holding periods a near-guaranteed loss.
• Positions under roughly $50,000. Transaction costs consume too much of small positions; the mathematics only work at scale.
• Return-seekers. Two decades of our index data show a store of value, not a growth asset. If you want yield or appreciation, diamonds will frustrate you.
• First-time tangible-asset buyers. Build liquidity and a gold position first. Diamonds are the specialist's addition, not the foundation.
• Bargain hunters. "Below-market" diamonds are how commercial goods get sold at investment prices. In this market, a discount you did not verify is a warning.

If you are unsure which side of the line your situation falls on, that is precisely what a first conversation is for. Request a consultation; we will tell you honestly if the answer is gold, or nothing at all.