How much does a 5.00ct+ I VS1 lab grown round diamond cost?

As of October 2026, 5.00ct+ I VS1 lab grown round diamonds typically cost £625 GBP to £22,759 GBP, with a median price of £3,605 GBP. There are currently 13 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 93%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I VS1 Lab Grown Round

Quick answer

As of October 2026, there are 13 lab grown round diamonds with I colour and VS1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £625 GBP to £22,759 GBP, with a median of £3,605 GBP. At least 32 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 93%. Half of all listings fall between £289 GBP and £745 GBP per carat. The same specification in natural form lists at a median of about £17,458 GBP per carat. Over the last 30 days the median price moved -11.8% and the number of listings moved +23.4%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

£454 GBP

Highest Price

£85,432 GBP

Average Price

£9,748 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

45.1%

Price Spread

92.9%

30-Day Price Trend

-11.8%

30-Day Supply Change

+23.4%

Volatility (30d)

0.05

Price Range

Price per carat distribution across retailers

$653/ct

10th Percentile

$239

Median

$653

90th Percentile

$1,655

Score Distribution

21 diamonds scored across 4 quality tiers

Excellent

6 (28.6%)

Very Good

7 (33.3%)

Good

4 (19.0%)

Average

4 (19.0%)

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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