How much does a 1.00 to 1.49ct J SI1 natural oval diamond cost?

As of September 2026, 1.00 to 1.49ct J SI1 natural oval diamonds typically cost $1,695 SGD to $4,664 SGD, with a median price of $2,803 SGD. There are currently 1,980 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI1 Natural Oval

Quick answer

As of September 2026, there are 1,980 natural oval diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,695 SGD to $4,664 SGD, with a median of $2,803 SGD. At least 51 retailers stock this exact specification. Half of all listings fall between $1,931 SGD and $3,050 SGD per carat. The same specification in lab grown form lists at a median of about $1,865 SGD 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

1,980

Lowest Price

$859 SGD

Highest Price

$15,773 SGD

Average Price

$3,029 SGD

Market Intelligence

Retailers Selling

Price Spread

46.2%

Price Range

Price per carat distribution across retailers

$1,902/ct

10th Percentile

$1,230

Median

$1,902

90th Percentile

$2,885

Score Distribution

2.0K diamonds scored across 4 quality tiers

Excellent

173 (8.7%)

Very Good

531 (26.8%)

Good

626 (31.6%)

Average

650 (32.8%)

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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