How much does a 1.50 to 1.99ct I SI1 natural heart diamond cost?

As of November 2026, 1.50 to 1.99ct I SI1 natural heart diamonds typically cost $4,279 SGD to $13,508 SGD, with a median price of $6,792 SGD. There are currently 174 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI1 Natural Heart

Quick answer

As of November 2026, there are 174 natural heart diamonds with I colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,279 SGD to $13,508 SGD, with a median of $6,792 SGD. At least 59 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $3,723 SGD and $6,238 SGD per carat. The same specification in lab grown form lists at a median of about $591 SGD per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +10.6%.

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. Heart natural stones in the index: 2,374 USD per carat, +9.8% 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: November 2026

Available

174

Lowest Price

$3,001 SGD

Highest Price

$21,426 SGD

Average Price

$7,731 SGD