How much does a 0.75-carat lab-grown diamond cost?

In our September 2026 comparison, a loose three-quarter-carat lab-grown diamond cost $197 to $488 across four sellers. Ritani was the least expensive and Blue Nile the most expensive. The seller-balanced typical price was about $453.

We searched for round diamonds from 0.70 to 0.80 carats, with E color, VVS2 clarity, and a high cut grade. The price is for the diamond alone; a ring setting, earrings, or pendant will increase the total.

Ritani was the clear price leader. Its five lowest qualifying round diamonds had a median price of $197, with individual prices from $190 to $199.

Read our Ritani review See 0.75-carat diamonds at Ritani

0.75-carat lab-grown diamond prices in 2026

Prices checked September 3, 202657 sampled listings across the full price study
Lowest seller benchmark$197
Typical across sellers$452.50
Full seller range$197–$488

“Typical” is the median of the seller benchmark prices above. Each seller counts once, so a jeweler with a much larger inventory cannot pull the figure down simply by listing more diamonds.

Seller and samplePriceDifference
RitaniMedian of five lowest results from the authorized API sample$197Lowest in our test
With Clarity0.75 ct public D/VVS2 Excellent-cut result$435120.8% more
Brilliant EarthMedian of five lowest close feed results; grading lab not supplied$470138.6% more
Blue Nile0.76 ct current E/VVS2 Ideal-cut result$488147.7% more

The four rows mix feed medians and single current listings, which are identified in the sample column. Grown Brilliance's current loose-diamond search begins at one carat, so we did not force it into this three-quarter-carat comparison.

What does a 0.75-carat diamond look like?

A well-proportioned 0.75-carat round diamond is usually about 5.8 to 5.9 millimeters wide. It is visibly larger than half a carat but still comfortable in a low, practical setting. On a slim band, it can give an engagement ring plenty of presence without feeling oversized.

Shape changes the look. An oval, pear, or marquise often covers more of the finger from top to bottom, while an emerald cut has a broader, quieter pattern of light. A halo can add more visible width; a bezel makes the outline stronger and offers extra protection.

How to get the best value

The guide recommended prioritizing cut, then color and clarity, and finally exact carat weight. That remains sensible. For a round diamond, start with Ideal or Excellent cut and check the video for even brightness and contrast.

You probably do not need E/VVS2. G–H color and eye-clean VS1–VS2 clarity are often better-value targets. Also search from about 0.70 carats rather than requiring exactly 0.75. A well-cut 0.71-carat stone can look better than a heavier diamond with weak proportions.

Compare the millimeter measurements and total ring price. The diamond may be inexpensive while a pavé, halo, or designer setting adds far more to the final bill.

See our lab-grown diamond buying guide

Three-quarter-carat round versus fancy-shaped diamonds

Fancy shapes can offer excellent value. Elongated ovals, pears, marquises, and emerald cuts often look larger than a three-quarter-carat round diamond. Some shapes cost less, but the price changes with demand, proportions, and how efficiently each stone was cut.

To compare shapes without mixing in different seller markups, we used the five lowest qualifying Ritani API results for each of ten shapes. Every diamond was 0.70 to 0.80 carats, E color, VVS2 clarity, and IGI graded. Round diamonds had Ritani's Ideal label; the fancy shapes had Very Good or better cut labels. In total, 825 Ritani diamonds met those rules.

Fancy-shaped price comparisonPrices from Ritani, using up to five qualifying diamonds per shape
ShapeMedian priceSample rangeCut used
Round$197$190–$199Ideal
Oval$221$218–$239Very Good
Emerald$205$201–$230Very Good
Pear$190$183–$192Very Good
Marquise$227$217–$228Very Good
Radiant$220$211–$223Very Good
Cushion$229$221–$259Very Good
Princess$221$216–$234Very Good
Asscher$360$279–$389Very Good
Heart$253$238–$269Very Good

Pear had the lowest five-listing median in this sample at $190. Asscher was highest at $360. That does not mean Asscher cuts are always the most expensive; it reflects the qualifying inventory available on the check date.

For ovals, pears, and marquises, inspect the center for a dark bow tie. For emerald and Asscher cuts, look for attractive, even steps rather than distracting dark zones or a see-through center.

Current three-quarter-carat examples

Round lab-grown diamond shown face-up

round · IGI

$190

0.73 ct · E · VVS2 · Ideal

Lowest qualifying round result in the API capture.

Visit Ritani
Oval lab-grown diamond shown face-up

oval · IGI

$218

0.76 ct · E · VVS2 · Very Good

Lowest qualifying oval result in the API capture.

Visit Ritani
Emerald-cut lab-grown diamond shown face-up

emerald · IGI

$201

0.80 ct · E · VVS2 · Very Good

Lowest qualifying emerald result in the API capture.

Visit Ritani
Pear-shaped lab-grown diamond shown face-up

pear · IGI

$183

0.73 ct · E · VVS2 · Very Good

Lowest qualifying pear result in the API capture.

Visit Ritani

Ritani's catalog images show each diamond shape, not the exact stones in our sample. Listings and prices can change after our check, so confirm the current diamond on the seller's site.

Good ring styles for a 0.75-carat diamond

A three-quarter-carat diamond is versatile enough for most settings. A slim solitaire keeps the diamond prominent; pavé adds sparkle without changing its outline; a halo makes it look larger; and a bezel is a useful everyday option for someone active or hard on jewelry.

The ring pictured above comes from the guide and shows a traditional pavé treatment. The merchant that originally sold that exact design, James Allen, is no longer a standalone store; its collection is now available through Blue Nile.

Where should you buy?

Prices can vary widely within the same carat range. Compare the actual diamond, grading report and complete ring price—not only the headline price—before choosing a seller.

JewelerBest forOur ratingShop
RitaniPrices, loose-diamond selection and value4.7/5See at Ritani
Blue NileA polished all-round shopping experience4.6/5See at Blue Nile
Brilliant EarthPremium settings, showrooms and guided shopping4.5/5See at Brilliant Earth

Ritani: best for price and selection

Ritani had the lowest current benchmark and 825 diamonds met the full rules across ten shapes. Its search tools and transparent cost breakdown make it the best starting point for value.

Blue Nile: best all-round alternative

Blue Nile is worth checking if you prefer its ring builder, inspection tools, support, showrooms, or the designs in its James Allen collection.

Brilliant Earth: best for showrooms and labeled sustainability collections

Brilliant Earth was more expensive in this test, but its showroom network, settings, and specifically labeled Renewable, Capture, and Sustainably Rated options can justify a comparison for some buyers.

Is a 0.75-carat lab-grown diamond worth it?

It is a strong middle ground: noticeably larger than half a carat, more restrained than a one-carat stone, and inexpensive relative to the setting. A good cut matters more than reaching exactly 0.75 on the certificate.

Lab-grown diamonds are real diamonds, but resale prices are weak. Buy one to wear, not as an investment. Sustainability also depends on how and where the diamond and jewelry were made, so prefer specific product-level information over broad green claims.

How prices have changed

In October 2024, our six-seller research found round 0.75-carat lab-grown diamonds from $443 to $1,092. Those stones used I–J color and VS1–VS2 clarity and the table reported seller ranges. The current benchmark uses E/VVS2 and a narrower method, so the comparison is directional rather than a formal index.

October 2024 archive

$443–$1,092

6 sellers · Round diamonds near 0.75 carats, I–J color, VS1–VS2 clarity, and Excellent or Ideal cut; seller ranges rather than one shared aggregation.

September 2026 test

$197–$488

4 sellers · Round diamonds from 0.70 to 0.80 carats, E color, VVS2 clarity, and a high cut grade; IGI grading where the source exposed it.

The dated and current ranges show how dramatically prices have moved, but they are not a like-for-like index: the studies used different color and clarity grades and reported seller ranges.

See our october 2024 fancy-shape archive

Starting prices near 0.75 carats, I–J color, VS1–VS2 clarity, and Very Good or better seller-reported cut. Individual listings are no longer current.

Sellerovalemeraldpearprincessradiantcushionheart
Ritani$294$150$220$321$352$449$668
Clean Origin$485$417$302$519$500——
With Clarity$658$541—$564$448$569—
Grown Brilliance$345$325$385$330$350$345$705
Brilliant Earth$760$640$640$680$640$780$680
James Allen (historical)$680$480$620$790$750$820$1,250

Our verdict

A close 0.75-carat lab-grown diamond cost $197 to $488 in our current test, with a seller-balanced typical price of about $453. Ritani is the first place we would look. Choose the cut and visible dimensions before chasing an exact milestone, then compare the complete jewelry price and return terms.

How we researched 0.75-carat prices

We checked US listings on September 3, 2026. The target was 0.70–0.80 carats, E color, VVS2 clarity, and a high cut grade. Ritani's complete filtered API capture produced 825 qualifying offers across ten shapes. Brilliant Earth's feed supplied 80 close high-cut round results but does not expose the grading lab. Blue Nile contributed a current E/VVS2 result; With Clarity's closest public match was D/VVS2, one color grade above the target. Grown Brilliance's current public loose-diamond search begins at 1.00 carat, so it was not added as an unlike comparison.

The current shape table compares shapes within Ritani, so different seller markups do not distort the result.

For the seller-balanced typical price, we take the median of the seller benchmark prices. Each seller contributes one benchmark, regardless of inventory size.

Prices checkedSeptember 3, 2026MarketUnited StatesCurrencyUS dollarsBenchmark0.7–0.8 ct · E · VVS2 · IGI

Ritani's complete filtered API capture produced 825 qualifying diamonds across ten shapes. Brilliant Earth's feed supplied 80 close high-cut round results, but it does not expose the grading lab. Blue Nile contributed a current E/VVS2 result. With Clarity's closest public match was D/VVS2, one color grade above our target, and the row says so. The current shape table uses one seller so that retailer markup does not obscure differences in available shapes.

The October 2024 seller and fancy-shape tables remain in the page as a dated archive. They preserve our research without presenting old listings as current stock.

Compare other carat weights

Update history

This guide was first published in March 2023 and updated as prices changed. The September 2026 edition adds current feed-backed prices, a like-for-like ten-shape comparison, fresh examples, clearer size and setting advice, and current seller recommendations while retaining the useful research and ring example from the article.