Lab-Grown Diamond Prices in 2026: What a Fair Price Looks Like and Where Your Money Actually Goes

You've got a number in your head. Maybe it's a bonus you plan to put toward a ring, or a budget you and your partner settled on over dinner. Then you open six tabs and one site lists a one carat lab-grown diamond near US$550 while another lists one around C$3,500. Both call their price fair.

They can't both be right, and almost nobody explains the gap. So here is what the market looks like in October 2026, plus a line-by-line look at where the money goes inside a finished ring.

Lab grown diamond price per carat: what the data says today

Start with the stone, because that's where most pages are either vague or out of date. One tracker of live listings put the median 1 carat lab-grown stone (G to I colour, VS1 to SI1 clarity) at US$670 on September 24. A separate sample of more than 400,000 asking prices from July showed a 1 carat round at US$545 per carat. At trade level, an IGI-certified 1 carat F colour, VS2 round wholesales near US$680, against US$3,410 in 2020. That's a fall of about 80 percent.

Retail is wider. Jeweller guides put a well-cut G to H, VS stone at US$700 to US$1,500.

Why are lab diamonds so cheap?

Because nothing about them is scarce. A mined stone is priced on rarity and a long supply chain. A lab stone comes out of a reactor on a schedule, and as supply scaled up, the price kept sliding.

Three details get skipped in most guides.

Size changes the per carat price more than people expect. Trackers show roughly US$506 to US$643 per carat at 1 carat, US$1,085 to US$1,314 at 2 carats and US$2,309 to US$2,618 at 5. A 2 carat stone costs about four times a 1 carat, not double.

Shape is the second. The old rule says rounds cost the most because cutting wastes rough, and plenty of guides still repeat it. In the July listing sample, 1 carat ovals asked US$606 per carat, cushions US$623, emeralds US$662 and princess cuts US$673, against US$545 for rounds. Check the per carat figure for your shape instead of assuming a discount.

Third, growth method. In that same data, HPHT stones asked 21 to 24 percent more than CVD at similar grades, so it's worth asking which one you're paying for.

Is the slide still going? Trackers disagree. One has per carat prices down 2.59 percent year over year, the smallest quarterly decline in two years. Another puts the 1 carat round down about 31 percent. Methodology matters, so treat any single figure with suspicion, including mine.

Engagement ring cost breakdown: where your money goes

Most pricing pages stop at the diamond. A ring is a diamond plus everything wrapped around it. Below is a model of a 1 carat G, VS oval in a 14k white gold solitaire with an IGI report, built from published inputs as of October 6, 2026. It's a model, not a quote.

Gold was US$4,176.81 an ounce on October 1, which works out to about US$78.56 a gram in 14k, since 14k is 58.5 percent pure. I assumed 3 grams for a plain solitaire. Labour is my estimate. Certification guides cite US$50 to US$150 per stone, so I used US$75. For duty, the US set a 10 percent tariff on gems and jewellery from India in late July, and lab-grown stones are not on the exemption list, so I charged 10 percent on the stone. Canadian duty on jewellery runs 0 to 8.5 percent depending on type and origin. The C$ column is the US$ figure at 1.40, close to the 1.401 rate on September 18.

The stone is just over half of landed cost. The metal is about a fifth. Retailers then add rent or ad spend, staff, returns, card fees and margin. I'd call US$1,500 to US$2,300 (C$2,100 to C$3,200) a fair finished price for this ring, or 1.3 to 2 times landed cost. That multiple is my judgment, not an industry standard. For scale, Brilliant Earth lists a 3 carat lab-grown ring from US$2,650 and the 3 carat stone from US$2,000, which implies a basic setting near US$650. By my numbers, a setting like this costs about US$420 to produce. That isn't outrageous. A plain solitaire priced above three times landed cost, about US$3,500 here, deserves a direct question about what's in the price.

Buying across the border: the costs nobody lists

Canada and the US make this messier than most pricing pages admit.

Tax lands on top. Canadian prices usually exclude GST or HST, which runs from 5 percent in Alberta to 15 percent in Atlantic Canada, with Quebec at 14.975 percent. US sites add state sales tax at checkout.

Ordering across the border adds duty, then tax on the duty-paid value, and sometimes a courier clearance fee. At the top 8.5 percent duty rate and Ontario's 13 percent HST, a US$2,000 ring becomes about C$3,430 once you convert at 1.40. Jewellery made in the US can qualify for 0 percent under CUSMA, so ask where your ring is actually made.

The exchange rate adds noise of its own. USD/CAD has moved between roughly 1.35 and 1.42 this year. A swing that size moves a C$3,000 ring by about C$170.

Four questions to ask before you pay

Ask any retailer these, in writing if you can.

• What is the per carat price of the stone, and what is the centre stone weight? A ring with a single 1.50 carat diamond costs much more than one with 1.50 carats of total weight spread across side stones, and listings blur the two.
• Is the quote in my currency, with tax and duty shown?
• Where was the ring made, and when was the gold last priced? Gold topped US$5,500 earlier this year and shed nearly US$1,200 in two days, and was near US$4,180 on October 1.

This page is refreshed every quarter, because gold, tariffs and exchange rates move faster than diamonds do. Last updated October 6, 2026.