How much does a 3.00 to 4.99ct I SI1 natural heart diamond cost?

As of September 2026, 3.00 to 4.99ct I SI1 natural heart diamonds typically cost $25,489 SGD to $71,866 SGD, with a median price of $42,584 SGD. There are currently 115 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI1 Natural Heart

Quick answer

As of September 2026, there are 115 natural heart diamonds with I colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $25,489 SGD to $71,866 SGD, with a median of $42,584 SGD. At least 19 retailers stock this exact specification. Half of all listings fall between $7,873 SGD and $11,883 SGD per carat. The same specification in lab grown form lists at a median of about $1,296 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. Heart natural stones in the index: 2,261 USD per carat, +1.7% 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

115

Lowest Price

$17,852 SGD

Highest Price

$247,240 SGD

Average Price

$46,581 SGD