How much does a 1.50 to 1.99ct I SI2 natural heart diamond cost?

As of October 2026, 1.50 to 1.99ct I SI2 natural heart diamonds typically cost $3,646 SGD to $10,879 SGD, with a median price of $5,985 SGD. There are currently 272 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 heart diamond?

About 39% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Natural Heart

Quick answer

As of October 2026, there are 272 natural heart diamonds with I colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $3,646 SGD to $10,879 SGD, with a median of $5,985 SGD. At least 52 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $3,081 SGD and $5,265 SGD per carat. The same specification in lab grown form lists at a median of about $3,258 SGD per carat. Over the last 30 days the median price moved -3.5% and the number of listings moved +15.8%.

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: October 2026

Available

272

Lowest Price

$2,394 SGD

Highest Price

$23,145 SGD

Average Price

$6,809 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

38.6%

Price Spread

56.7%

30-Day Price Trend

-3.5%

30-Day Supply Change

+15.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,013/ct

10th Percentile

$2,013

Median

$3,013

90th Percentile

$5,361

Score Distribution

751 diamonds scored across 4 quality tiers

Excellent

176 (23.4%)

Very Good

112 (14.9%)

Good

163 (21.7%)

Average

300 (39.9%)

Find Your Diamond

Search 272 I SI2 heart diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

Save 15%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 15%

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