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

As of October 2026, 1.50 to 1.99ct D SI1 natural heart diamonds typically cost $6,545 SGD to $19,428 SGD, with a median price of $10,490 SGD. There are currently 90 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 49%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Heart

Quick answer

As of October 2026, there are 90 natural heart diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,545 SGD to $19,428 SGD, with a median of $10,490 SGD. At least 55 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between $4,998 SGD and $8,036 SGD per carat. The same specification in lab grown form lists at a median of about $435 SGD per carat. Over the last 30 days the median price moved +0.1% and the number of listings moved +10.2%.

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

Lowest Price

$4,684 SGD

Highest Price

$32,697 SGD

Average Price

$12,025 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

28.9%

Price Spread

49.4%

30-Day Price Trend

+0.1%

30-Day Supply Change

+10.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$4,798/ct

10th Percentile

$3,284

Median

$4,798

90th Percentile

$8,066

Score Distribution

292 diamonds scored across 4 quality tiers

Excellent

46 (15.8%)

Very Good

45 (15.4%)

Good

58 (19.9%)

Average

143 (49.0%)

Find Your Diamond

Search 90 D SI1 heart diamonds and compare prices.

Search Diamonds

Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

Save 22%

Lab-Grown D SI1Same specifications, lab-grown origin

Save 93%

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