How much does a 3.00 to 4.99ct I SI2 lab grown oval diamond cost?

As of October 2026, 3.00 to 4.99ct I SI2 lab grown oval diamonds typically cost $835 SGD to $62,422 SGD, with a median price of $30,248 SGD. There are currently 5 diamonds matching this specification available across retailers.

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

About 56% of these diamonds are available at multiple retailers, with an average price spread of 82%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Lab Grown Oval

Quick answer

As of October 2026, there are 5 lab grown oval diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $835 SGD to $62,422 SGD, with a median of $30,248 SGD. At least 19 retailers stock this exact specification, and 56% of the stones appear at more than one of them, with an average price spread of 82%. Half of all listings fall between $295 SGD and $705 SGD per carat. The same specification in natural form lists at a median of about $13,854 SGD per carat. Over the last 30 days the median price moved +6.2% and the number of listings moved +20.9%.

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

3.04ct Oval I SI2, IGI, grade B+, from $699 SGD

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

$699 SGD

Highest Price

$70,064 SGD

Average Price

$28,100 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

55.6%

Price Spread

82.1%

30-Day Price Trend

+6.2%

30-Day Supply Change

+20.9%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$389/ct

10th Percentile

$171

Median

$389

90th Percentile

$856

Score Distribution

7 diamonds scored across 3 quality tiers

Very Good

2 (28.6%)

Good

1 (14.3%)

Average

4 (57.1%)

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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