How much does a 1.00 to 1.49ct E SI1 natural radiant diamond cost?

As of October 2026, 1.00 to 1.49ct E SI1 natural radiant diamonds typically cost £1,555 GBP to £5,220 GBP, with a median price of £2,388 GBP. There are currently 247 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI1 radiant diamond?

About 41% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct E SI1 Natural Radiant

Quick answer

As of October 2026, there are 247 natural radiant diamonds with E colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,555 GBP to £5,220 GBP, with a median of £2,388 GBP. At least 63 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,879 GBP and £3,124 GBP per carat. The same specification in lab grown form lists at a median of about £306 GBP per carat. Over the last 30 days the median price moved +0.3% and the number of listings moved +10.4%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

247

Lowest Price

£793 GBP

Highest Price

£9,389 GBP

Average Price

£2,866 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

40.9%

Price Spread

53.4%

30-Day Price Trend

+0.3%

30-Day Supply Change

+10.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,121/ct

10th Percentile

$2,146

Median

$3,121

90th Percentile

$5,219

Score Distribution

645 diamonds scored across 5 quality tiers

Exceptional

1 (0.2%)

Excellent

127 (19.7%)

Very Good

146 (22.6%)

Good

109 (16.9%)

Average

262 (40.6%)

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Consider Instead

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

F SI1F colour is visually identical to E to the naked eye

Save 10%

E SI2SI2 inclusions are not visible without magnification

Save 15%

Lab-Grown E SI1Same specifications, lab-grown origin

Save 86%

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