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

As of September 2026, 1.00 to 1.49ct J I1 natural oval diamonds typically cost £843 GBP to £2,613 GBP, with a median price of £1,529 GBP. There are currently 279 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 47%. 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 September 2026, there are 279 natural oval diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £843 GBP to £2,613 GBP, with a median of £1,529 GBP. At least 25 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between £850 GBP and £1,410 GBP per carat. The same specification in lab grown form lists at a median of about £1,546 GBP per carat. Over the last 30 days the median price moved -4.3% and the number of listings moved +0.5%.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Oval natural stones in the index: 2,380 USD per carat, -9.6% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

279

Lowest Price

£372 GBP

Highest Price

£3,922 GBP

Average Price

£1,649 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

33.5%

Price Spread

46.9%

30-Day Price Trend

-4.3%

30-Day Supply Change

+0.5%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,612/ct

10th Percentile

$880

Median

$1,612

90th Percentile

$2,346

Score Distribution

279 diamonds scored across 4 quality tiers

Excellent

4 (1.4%)

Very Good

41 (14.7%)

Good

35 (12.5%)

Average

199 (71.3%)

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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