How much does a 0.20 to 0.49ct H SI1 natural oval diamond cost?

As of October 2026, 0.20 to 0.49ct H SI1 natural oval diamonds typically cost £226 GBP to £637 GBP, with a median price of £343 GBP. There are currently 540 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 oval diamond?

About 24% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct H SI1 Natural Oval

Quick answer

As of October 2026, there are 540 natural oval diamonds with H colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £226 GBP to £637 GBP, with a median of £343 GBP. At least 21 retailers stock this exact specification, and 24% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between £791 GBP and £1,192 GBP per carat. The same specification in lab grown form lists at a median of about £452 GBP per carat. Over the last 30 days the median price moved -3.9% and the number of listings moved -15.4%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

540

Lowest Price

£98 GBP

Highest Price

£1,079 GBP

Average Price

£379 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

24.1%

Price Spread

41.4%

30-Day Price Trend

-3.9%

30-Day Supply Change

-15.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,292/ct

10th Percentile

$834

Median

$1,292

90th Percentile

$1,986

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

91 (7.1%)

Very Good

333 (26.0%)

Good

298 (23.3%)

Average

559 (43.6%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2SI2 inclusions are not visible without magnification

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Lab-Grown H SI1Same specifications, lab-grown origin

Save 53%

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