How much does a 3.00 to 4.99ct I VS1 lab grown cushion diamond cost?

As of October 2026, 3.00 to 4.99ct I VS1 lab grown cushion diamonds typically cost £498 GBP to £3,437 GBP, with a median price of £1,293 GBP. There are currently 119 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 110%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I VS1 Lab Grown Cushion

Quick answer

As of October 2026, there are 119 lab grown cushion diamonds with I colour and VS1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £498 GBP to £3,437 GBP, with a median of £1,293 GBP. At least 42 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 110%. Half of all listings fall between £238 GBP and £709 GBP per carat. The same specification in natural form lists at a median of about £10,883 GBP per carat. Over the last 30 days the median price moved +8.6% and the number of listings moved +14.1%.

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. Cushion lab grown stones in the index: 516 USD per carat, +6.9% 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

119

Lowest Price

£309 GBP

Highest Price

£8,493 GBP

Average Price

£1,796 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

32.1%

Price Spread

109.6%

30-Day Price Trend

+8.6%

30-Day Supply Change

+14.1%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$572/ct

10th Percentile

$249

Median

$572

90th Percentile

$1,466

Score Distribution

198 diamonds scored across 4 quality tiers

Excellent

63 (31.8%)

Very Good

40 (20.2%)

Good

46 (23.2%)

Average

49 (24.7%)

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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