5, 6 and 7 Carat Lab Grown Diamond Rings: What They Actually Cost

A 5 carat lab grown ring starts at $5,999 at Liori, a 6 carat at $7,999 and a 7 carat at $8,999. Those are complete rings with the centre stone already set, not loose stones or empty settings. Ask the same question anywhere else and you will be quoted $50,000 or $119,124 or $145,000, because those pages are pricing natural diamonds, and at this size the two markets have almost nothing to do with each other.

What a 5, 6 or 7 carat lab grown ring costs

Here is what each size costs at Liori right now, as a finished ring: a certified lab grown centre stone already set in 18k white gold, with nothing left to budget for. Prices come from live inventory pulled on 30 August 2026, and every design below sits in our lab grown engagement ring collection. The round brilliant column is there because round is the shape most people picture first, and it is the one that costs the most at every rung.

The interesting part is not the top row. It is that seven carats opens at $8,999 while a five carat round costs the same $8,999. Weight is not what you are paying for at this end of the market. If you want to see how the price behaves further down the ladder, our lab grown cost per carat ladder covers every rung from one carat up.

Why the quotes you found disagree so wildly

Search this question and you will get answers spread across two orders of magnitude. One buying guide calls $145,000 a realistic budget. A price aggregator puts the average five carat stone at $119,124. A designer jeweller says natural five carat stones start around $50,000. Then a retailer advertises the same size "from $1,610" and a chain store lists five to seven carat rings from $5,500. None of them is lying. They are answering three different questions.

Some are pricing natural, some lab grown. This is most of the spread. A natural five carat stone is a genuinely rare object, and price climbs steeply with weight because of it. GIA is direct about the mechanism: large diamonds command a premium, so much so that the difference in price isn't geometric but exponential. A lab grown stone is the same material with the same optical properties, but none of that scarcity, so the curve is far flatter. Our own explainer on why lab grown diamonds cost less goes through the economics.

Some are pricing a setting, not a ring. A "from $1,610" headline on a five carat page is usually the mount. The stone is chosen and paid for separately, which is how a page can advertise a number that looks impossible. One of the longest guides on page one answers its own title question with $1,500 to $5,000, and only in the following sentence does it explain that this is the semi-mount and you should ask a retailer about the diamond.

Some are adding up small stones. A listing described as five to seven carats can mean total carat weight: the centre stone plus every accent diamond on the band, counted together. GIA draws the line clearly, noting that an engagement ring with a single diamond weighing 1.50 ct will cost significantly more than an engagement ring with a total diamond weight of 1.50 carats. A five carat total weight ring might have a one carat centre and four carats of pavé. It is a perfectly nice ring. It is not what you searched for. Federal rules take this seriously enough that the FTC's jewellery guides make it unfair or deceptive to misrepresent the weight of a diamond, with a disclosure obligation attached to fractional weight claims.

So there is one question to ask any listing at this size, before price: is this weight one stone, and does the price include it? Everything on this page answers yes to both.

Five carats

Five carats is where this band starts and where almost all of the choice lives. We have thirty-two designs live at this weight against five at six carats, and the entry price is the lowest of the three at $5,999 for the emerald cut wire basket solitaire. Every shape we stock in the band exists at five carats, which is not true a rung higher.

It also reads unmistakably as a big diamond. Five carats is roughly five times the weight most engagement rings are built around, and our guide to average engagement ring carat size puts that gap in context. On most hands a stone this size covers the finger from edge to edge.

Pick five carats if you want a statement stone and you also want a say in what it looks like. It is the only rung in this band where shape, setting and budget are all still genuinely open.

Six carats

Six carats costs $7,999 to enter, and the honest thing to say about it is that the selection is thin. Five designs, one each in emerald, radiant, oval, cushion and round. That is the whole menu at this weight, and it is a real constraint rather than a temporary gap.

What you get for the extra $2,000 over five carats is a stone that is noticeably heavier on the hand without moving into seven carat territory. Whether that reads as meaningfully bigger depends more on shape than on the weight, which is the subject of the next section but one. If you have already decided you want the largest stone you can get and you do not care much which shape it is, skip this rung and read the seven carat section instead. Six carats is the compromise position, and compromise positions are worth taking only when you actually want what is on offer.

Pick six carats if one of those five designs is the one you wanted anyway. If you are choosing it because it sits between the other two numbers, you are choosing a number rather than a ring. Our emerald cut range is where the cheapest six carat option sits.

Seven carats

Seven carats opens at $8,999, which is the same money as the cheapest five carat round brilliant. That is the single most useful fact in this article. If you are willing to wear a step cut, seven carats costs you nothing over five.

The trade is choice. Seven designs exist at this weight and they cover four shapes: emerald, radiant, round and asscher. Oval, pear and cushion all run out below seven carats in our range. The seven carat emerald split shank is the entry point, and the round brilliant equivalent is $12,999.

A stone this size also changes how the ring has to be built. More weight means more strain on the prongs and a higher profile off the finger unless the basket is set deliberately low. That is a conversation to have before you buy rather than after.

Pick seven carats if presence is the whole point and you are relaxed about shape. If you have your heart set on an oval, five carats is your ceiling here, and a ring that is the right shape but a size down beats the reverse every time.

Shape moves the price more than carat does

At this size the shape you choose is worth more money than the weight you choose. Below is the entry price for each shape across the whole five to seven carat band, and the spread is $8,000 wide on stones of broadly similar weight.

Emerald is cheapest at $5,999. Radiant, oval and pear follow at $6,999. Cushion and round brilliant sit at $8,999, princess at $9,999, and asscher at $13,999 because we hold a single design in it. The pattern holds at every rung: emerald opens five carats at $5,999, six at $7,999 and seven at $8,999, while round runs $8,999, $9,999 and $12,999 for the same three weights.

Round costs more everywhere because it is cut for maximum light return, which wastes more of the rough, and because demand for it never softens. If sparkle is the thing you care about, that premium is buying you something real. If size is the thing you care about, you are paying $3,000 for a shape. Our shape-by-shape comparison covers how each one behaves face-up.

What to insist on at this size

A five carat stone is not a one carat stone scaled up. Everything gets bigger, including the things you would rather not see, so the grades worth paying for shift. This is the floor we would hold to, and every design in our oval and fancy shape ranges at this weight meets it:

• Confirm the weight is one stone. Ask whether the carat figure is the centre stone or the total, and get it in writing on the report. This is the difference between the ring you wanted and a ring that shares its headline number.
• Confirm the price includes the stone. At this size the setting is a small fraction of the total, so a quote that covers only the mount is not a near miss. It is a different order of number.
• Cut before colour, every time. GIA is blunt that a larger diamond doesn't guarantee visual pizzazz, and that brightness comes primarily from the cut. A weak cut at seven carats is visible across a room.
• Buy step cuts cleaner. GIA notes that emerald cuts have long facets that do not hide inclusions well and less scintillation to mask colour, so clarity and colour grades matter more. Since emerald and asscher are the value shapes here, this is where the saving partly goes back.
• Judge colour in the metal it will sit in. Warmth shows more in a big stone, and white gold is less forgiving than yellow. Our colour chart from D through Z marks where the visible steps are.
• A report from GIA or IGI, and nothing else. Every Liori centre stone carries one, with a number you can check against the laboratory's own database. Our certification guide explains how to read one.
• Ask about the prongs and the profile. A seven carat centre needs enough metal to hold it and a basket low enough to live with. Watch it move on video before you commit.

Why lab grown wins bigger as the stone gets bigger

The case for a lab grown stone at one carat is decent. At seven carats it is close to overwhelming, and the reason is arithmetic rather than opinion. Natural diamond prices climb exponentially with weight because large rough is rare. Lab grown prices climb far more gently. The gap between them therefore stretches as you go up, not smoothly rung by rung, but decisively: by the time you reach this band it has stopped being a discount and become a different price bracket.

Both columns are our own live inventory, so this is not a market estimate. At one carat, natural starts at $4,075 against $1,599 lab, about two and a half times. At five carats it is $62,675 against $5,999, more than ten times. At seven carats it is $120,975 against $8,999, about thirteen times. Nothing about the stone changes across that gap. A lab grown diamond is a diamond by every physical and optical measure, which our piece on lab grown versus natural sets out in full.

The fair objection is resale, and it deserves a straight answer instead of a dodge. Lab grown stones do not hold value the way natural ones do. The counterweight is that you are risking a fraction of the money in the first place, and at seven carats that fraction is around $112,000 of difference. We wrote the unvarnished version in our article on lab grown resale value. If you are weighing the natural route, what a 4 carat ring is worth covers the rung below this one.

Frequently Asked Questions (FAQ)

Short answers to what buyers ask us most about oversized stones. If your question is not here, our diamond consultants are reachable around the clock.

How much is a 5 carat diamond ring?

It depends almost entirely on whether the stone is lab grown or natural. At Liori a complete 5 carat lab grown ring starts at $5,999 in emerald cut, $6,999 in radiant, oval or pear, and $8,999 in round brilliant. The same size in a natural stone starts at $62,675 in our own range. Both figures include the centre stone set in 18k white gold. Published averages for natural five carat stones run from around $50,000 to $119,124 depending on quality, which is why a single answer to this question does not exist.

What is the average price of a 5 carat diamond ring?

An average across both markets would be meaningless, because lab grown and natural prices at this weight differ by a factor of ten. A diamond price aggregator puts the average natural 5 carat stone at $119,124, with a range wide enough to swallow most other estimates. For lab grown the useful number is not an average but a floor, and ours is $5,999. Comparing the two as if they were one market is the single most common way buyers end up confused at this size.

Is a 5 carat diamond considered big?

Yes, by a wide margin. Most engagement rings are built around a stone under a carat and a half, so five carats is several times the usual centre stone and reads as a statement piece on any hand. It covers most of the width of the finger. GIA notes that nature produces far more diamonds under a carat than over one, which is why natural stones at this weight are priced the way they are.

What is the best shape for a 5 carat diamond?

Emerald if you want the most stone for the money, round if sparkle is what you are after, and oval if covering the finger matters most. At five carats emerald opens at $5,999 and round at $8,999, so the shape decision is worth $3,000 before you have discussed anything else. Emerald and asscher do ask for a cleaner clarity grade in return, because step cuts hide less than brilliant faceting does.

Why do some 5 to 7 carat rings cost only a few thousand dollars?

Usually because the carat figure is a total rather than a single stone. A ring advertised at five to seven carats can be a modest centre stone surrounded by several carats of small accent diamonds, all counted together. GIA distinguishes carat weight, which describes one stone, from total carat weight, which describes every diamond in the piece. Ask which one a listing means before you compare it to anything else.

Can you get a 7 carat ring for the price of a 5 carat one?

In lab grown, yes, if you are flexible about shape. Our seven carat emerald cut starts at $8,999, which is exactly what the cheapest five carat round brilliant costs. The catch is choice: seven carats exists in four shapes in our range against every shape we stock at five carats. You are trading options for size, not quality.

Do lab grown diamonds hold their value at this size?

No, and it is better to know that before you buy. A lab grown stone is a real diamond by every physical measure, but the resale market treats it differently from a natural one. The offset is scale: at seven carats you are committing around $9,000 rather than $121,000, so the amount at risk is far smaller even though the percentage is worse. We set out the full picture, without the sales gloss, in our piece on resale value.