How much does a 5.00ct+ F SI1 natural cushion diamond cost?

As of October 2026, 5.00ct+ F SI1 natural cushion diamonds typically cost $100,040 SGD to $239,836 SGD, with a median price of $151,862 SGD. There are currently 20 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 36%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ F SI1 Natural Cushion

Quick answer

As of October 2026, there are 20 natural cushion diamonds with F colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $100,040 SGD to $239,836 SGD, with a median of $151,862 SGD. At least 41 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 36%. Half of all listings fall between $20,569 SGD and $29,726 SGD per carat. The same specification in lab grown form lists at a median of about $391 SGD per carat. Over the last 30 days the median price moved +0.2% and the number of listings moved -2.1%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

$71,274 SGD

Highest Price

$370,092 SGD

Average Price

$159,103 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

32.6%

Price Spread

36.3%

30-Day Price Trend

+0.2%

30-Day Supply Change

-2.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$19,729/ct

10th Percentile

$13,563

Median

$19,729

90th Percentile

$26,225

Score Distribution

47 diamonds scored across 4 quality tiers

Excellent

4 (8.5%)

Very Good

14 (29.8%)

Good

5 (10.6%)

Average

24 (51.1%)

Find Your Diamond

Search 20 F SI1 cushion diamonds and compare prices.

Search Diamonds

Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 22%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 98%

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