How much does a 0.20 to 0.49ct G VS1 lab grown marquise diamond cost?

As of October 2026, 0.20 to 0.49ct G VS1 lab grown marquise diamonds typically cost £66 GBP to £276 GBP, with a median price of £97 GBP. There are currently 67 diamonds matching this specification available across retailers.

Where can I find the best price on a G VS1 marquise diamond?

About 45% of these diamonds are available at multiple retailers, with an average price spread of 132%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G VS1 Lab Grown Marquise

Quick answer

As of October 2026, there are 67 lab grown marquise diamonds with G colour and VS1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £66 GBP to £276 GBP, with a median of £97 GBP. At least 11 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 132%. Half of all listings fall between £204 GBP and £647 GBP per carat. The same specification in natural form lists at a median of about £1,149 GBP per carat. Over the last 30 days the median price moved +6.7% and the number of listings moved +52.9%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise lab grown stones in the index: 485 USD per carat, -3.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

£63 GBP

Highest Price

£936 GBP

Average Price

£140 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

45.5%

Price Spread

132.4%

30-Day Price Trend

+6.7%

30-Day Supply Change

+52.9%

Volatility (30d)

0.12

Price Range

Price per carat distribution across retailers

$448/ct

10th Percentile

$239

Median

$448

90th Percentile

$1,122

Score Distribution

84 diamonds scored across 4 quality tiers

Excellent

46 (54.8%)

Very Good

18 (21.4%)

Good

7 (8.3%)

Average

13 (15.5%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1