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

As of October 2026, 1.50 to 1.99ct G SI1 lab grown oval diamonds typically cost £375 GBP to £1,007 GBP, with a median price of £553 GBP. There are currently 38 diamonds matching this specification available across retailers.

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

About 14% of these diamonds are available at multiple retailers, with an average price spread of 85%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 38 lab grown oval diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £375 GBP to £1,007 GBP, with a median of £553 GBP. At least 36 retailers stock this exact specification, and 14% of the stones appear at more than one of them, with an average price spread of 85%. Half of all listings fall between £246 GBP and £556 GBP per carat. The same specification in natural form lists at a median of about £4,444 GBP per carat. Over the last 30 days the median price moved +1.6% and the number of listings moved +16.0%.

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 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

Lowest Price

£119 GBP

Highest Price

£2,723 GBP

Average Price

£692 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

14.3%

Price Spread

84.7%

30-Day Price Trend

+1.6%

30-Day Supply Change

+16.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$487/ct

10th Percentile

$191

Median

$487

90th Percentile

$1,045

Score Distribution

135 diamonds scored across 4 quality tiers

Excellent

8 (5.9%)

Very Good

14 (10.4%)

Good

65 (48.1%)

Average

48 (35.6%)

Find Your Diamond

Search 38 G SI1 oval diamonds and compare prices.

Search Diamonds

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