How much does a 1.50 to 1.99ct J SI1 lab grown oval diamond cost?

As of October 2026, 1.50 to 1.99ct J SI1 lab grown oval diamonds typically cost £631 GBP to £1,964 GBP, with a median price of £864 GBP. There are currently 173 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 oval diamond?

About 54% of these diamonds are available at multiple retailers, with an average price spread of 68%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 173 lab grown oval diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £631 GBP to £1,964 GBP, with a median of £864 GBP. At least 14 retailers stock this exact specification, and 54% of the stones appear at more than one of them, with an average price spread of 68%. Half of all listings fall between £645 GBP and £1,211 GBP per carat. The same specification in natural form lists at a median of about £2,456 GBP per carat. Over the last 30 days the median price moved -4.7% and the number of listings moved -2.8%.

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 lab grown stones in the index: 453 USD per carat, -7.4% 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

173

Lowest Price

£149 GBP

Highest Price

£4,569 GBP

Average Price

£1,200 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

53.8%

Price Spread

67.8%

30-Day Price Trend

-4.7%

30-Day Supply Change

-2.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,112/ct

10th Percentile

$702

Median

$1,112

90th Percentile

$2,088

Score Distribution

289 diamonds scored across 4 quality tiers

Excellent

146 (50.5%)

Very Good

23 (8.0%)

Good

29 (10.0%)

Average

91 (31.5%)

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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