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

As of October 2026, 1.50 to 1.99ct J SI1 natural oval diamonds typically cost $3,973 SGD to $12,492 SGD, with a median price of $7,349 SGD. There are currently 390 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI1 Natural Oval

Quick answer

As of October 2026, there are 390 natural oval diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $3,973 SGD to $12,492 SGD, with a median of $7,349 SGD. At least 59 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between $3,110 SGD and $5,408 SGD per carat. The same specification in lab grown form lists at a median of about $1,425 SGD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +5.9%.

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 natural stones in the index: 2,655 USD per carat, +10.2% 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

390

Lowest Price

$2,346 SGD

Highest Price

$21,228 SGD

Average Price

$7,790 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

37.8%

Price Spread

54.8%

30-Day Price Trend

-1.4%

30-Day Supply Change

+5.9%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,270/ct

10th Percentile

$1,863

Median

$3,270

90th Percentile

$5,318

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

133 (12.3%)

Very Good

212 (19.5%)

Good

199 (18.3%)

Average

541 (49.9%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J SI2SI2 inclusions are not visible without magnification

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Lab-Grown J SI1Same specifications, lab-grown origin

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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