How much does a 1.00 to 1.49ct J SI2 natural oval diamond cost?

As of September 2026, 1.00 to 1.49ct J SI2 natural oval diamonds typically cost £859 GBP to £2,437 GBP, with a median price of £1,465 GBP. There are currently 1,857 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI2 oval diamond?

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1.00 to 1.49ct J SI2 Natural Oval

Quick answer

As of September 2026, there are 1,857 natural oval diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £859 GBP to £2,437 GBP, with a median of £1,465 GBP. At least 47 retailers stock this exact specification. Half of all listings fall between £1,010 GBP and £1,629 GBP per carat. The same specification in lab grown form lists at a median of about £1,325 GBP per carat.

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

1,857

Lowest Price

£481 GBP

Highest Price

£9,072 GBP

Average Price

£1,583 GBP

Market Intelligence

Retailers Selling

Price Spread

48.2%

Price Range

Price per carat distribution across retailers

$1,734/ct

10th Percentile

$1,109

Median

$1,734

90th Percentile

$2,686

Score Distribution

1.9K diamonds scored across 4 quality tiers

Excellent

148 (8.0%)

Very Good

527 (28.4%)

Good

603 (32.5%)

Average

579 (31.2%)

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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