How much does a 1.00 to 1.49ct I I1 natural oval diamond cost?

As of October 2026, 1.00 to 1.49ct I I1 natural oval diamonds typically cost £906 GBP to £2,951 GBP, with a median price of £1,705 GBP. There are currently 140 diamonds matching this specification available across retailers.

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

About 28% 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 I I1 Natural Oval

Quick answer

As of October 2026, there are 140 natural oval diamonds with I colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £906 GBP to £2,951 GBP, with a median of £1,705 GBP. At least 28 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,024 GBP and £1,776 GBP per carat. The same specification in lab grown form lists at a median of about £357 GBP per carat. Over the last 30 days the median price moved -3.6% and the number of listings moved +4.0%.

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

140

Lowest Price

£458 GBP

Highest Price

£4,877 GBP

Average Price

£1,835 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

28.1%

Price Spread

52.6%

30-Day Price Trend

-3.6%

30-Day Supply Change

+4.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,916/ct

10th Percentile

$1,045

Median

$1,916

90th Percentile

$3,140

Score Distribution

385 diamonds scored across 4 quality tiers

Excellent

17 (4.4%)

Very Good

65 (16.9%)

Good

59 (15.3%)

Average

244 (63.4%)

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Consider Instead

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

J I1J colour is visually identical to I to the naked eye

Save 16%

Lab-Grown I I1Same specifications, lab-grown origin

Save 75%

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