How much does a 1.00 to 1.49ct I I1 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct I I1 natural cushion diamonds typically cost $1,773 SGD to $4,528 SGD, with a median price of $2,553 SGD. There are currently 169 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 cushion diamond?

About 18% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I I1 Natural Cushion

Quick answer

As of September 2026, there are 169 natural cushion diamonds with I colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,773 SGD to $4,528 SGD, with a median of $2,553 SGD. At least 20 retailers stock this exact specification, and 18% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $1,845 SGD and $2,954 SGD per carat. The same specification in lab grown form lists at a median of about $3,310 SGD per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved +7.2%.

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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

169

Lowest Price

$1,411 SGD

Highest Price

$10,482 SGD

Average Price

$3,044 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

18.4%

Price Spread

50.5%

30-Day Price Trend

-1.7%

30-Day Supply Change

+7.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,648/ct

10th Percentile

$1,225

Median

$1,648

90th Percentile

$2,957

Score Distribution

169 diamonds scored across 4 quality tiers

Excellent

2 (1.2%)

Very Good

12 (7.1%)

Good

15 (8.9%)

Average

140 (82.8%)

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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