How much does a 0.20 to 0.49ct I I1 natural heart diamond cost?

As of October 2026, 0.20 to 0.49ct I I1 natural heart diamonds typically cost £243 GBP to £340 GBP, with a median price of £304 GBP. There are currently 5 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 heart diamond?

About 2% of these diamonds are available at multiple retailers, with an average price spread of 18%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I I1 Natural Heart

Quick answer

As of October 2026, there are 5 natural heart diamonds with I colour and I1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £243 GBP to £340 GBP, with a median of £304 GBP. At least 9 retailers stock this exact specification, and 2% of the stones appear at more than one of them, with an average price spread of 18%. Half of all listings fall between £731 GBP and £875 GBP per carat. Over the last 30 days the median price moved 0.0% and the number of listings moved +1.5%.

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

0.30ct Heart I I1, GIA, grade C, from £348 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. Heart natural stones in the index: 2,374 USD per carat, +9.8% 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

£142 GBP

Highest Price

£372 GBP

Average Price

£292 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

1.6%

Price Spread

18.0%

30-Day Price Trend

0.0%

30-Day Supply Change

+1.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,071/ct

10th Percentile

$904

Median

$1,071

90th Percentile

$1,303

Score Distribution

31 diamonds scored across 3 quality tiers

Very Good

1 (3.2%)

Good

1 (3.2%)

Average

29 (93.5%)

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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