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 $24,380 SGD to $68,738 SGD, with a median price of $40,731 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 $24,380 SGD to $68,738 SGD, with a median of $40,731 SGD. At least 26 retailers stock this exact specification. Half of all listings fall between $8,094 SGD and $10,267 SGD per carat. The same specification in lab grown form lists at a median of about $1,331 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

$17,065 SGD

Highest Price

$236,479 SGD

Average Price

$44,553 SGD