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

As of October 2026, 1.00 to 1.49ct J I1 natural oval diamonds typically cost £933 GBP to £2,711 GBP, with a median price of £1,654 GBP. There are currently 64 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Natural Oval

Quick answer

As of October 2026, there are 64 natural oval diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £933 GBP to £2,711 GBP, with a median of £1,654 GBP. At least 26 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between £838 GBP and £1,507 GBP per carat. The same specification in lab grown form lists at a median of about £288 GBP per carat. Over the last 30 days the median price moved -5.6% and the number of listings moved +7.6%.

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

Lowest Price

£490 GBP

Highest Price

£3,574 GBP

Average Price

£1,772 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

29.8%

Price Spread

55.5%

30-Day Price Trend

-5.6%

30-Day Supply Change

+7.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,607/ct

10th Percentile

$861

Median

$1,607

90th Percentile

$2,779

Score Distribution

273 diamonds scored across 4 quality tiers

Excellent

4 (1.5%)

Very Good

37 (13.6%)

Good

29 (10.6%)

Average

203 (74.4%)

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Consider Instead

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

Lab-Grown J I1Same specifications, lab-grown origin

Save 76%

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