How much does a 1.50 to 1.99ct I IF lab grown round diamond cost?

As of October 2026, 1.50 to 1.99ct I IF lab grown round diamonds typically cost £987 GBP to £2,561 GBP, with a median price of £1,774 GBP. There are currently 1 diamonds matching this specification available across retailers.

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

About 47% of these diamonds are available at multiple retailers, with an average price spread of 87%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I IF Lab Grown Round

Quick answer

As of October 2026, there are 1 lab grown round diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £987 GBP to £2,561 GBP, with a median of £1,774 GBP. At least 23 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 87%. Half of all listings fall between £202 GBP and £505 GBP per carat. The same specification in natural form lists at a median of about £4,756 GBP per carat. Over the last 30 days the median price moved -28.9% and the number of listings moved -28.3%.

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

1.63ct Round I IF, IGI, grade B+, from £790 GBP

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

£790 GBP

Highest Price

£2,758 GBP

Average Price

£1,774 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

47.4%

Price Spread

86.9%

30-Day Price Trend

-28.9%

30-Day Supply Change

-28.3%

Volatility (30d)

0.10

Price Range

Price per carat distribution across retailers

$463/ct

10th Percentile

$202

Median

$463

90th Percentile

$1,066

Score Distribution

2 diamonds scored across 2 quality tiers

Very Good

1 (50.0%)

Average

1 (50.0%)

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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