How much does a 1.00 to 1.49ct J SI2 natural cushion diamond cost?

As of October 2026, 1.00 to 1.49ct J SI2 natural cushion diamonds typically cost HK$8,422 HKD to HK$25,032 HKD, with a median price of HK$15,660 HKD. There are currently 275 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Cushion

Quick answer

As of October 2026, there are 275 natural cushion diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run HK$8,422 HKD to HK$25,032 HKD, with a median of HK$15,660 HKD. At least 50 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between HK$9,431 HKD and HK$18,155 HKD per carat. Over the last 30 days the median price moved +0.2% and the number of listings moved +7.6%.

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. 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

275

Lowest Price

HK$5,692 HKD

Highest Price

HK$49,980 HKD

Average Price

HK$16,293 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

36.9%

Price Spread

65.0%

30-Day Price Trend

+0.2%

30-Day Supply Change

+7.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,710/ct

10th Percentile

$933

Median

$1,710

90th Percentile

$2,942

Score Distribution

669 diamonds scored across 4 quality tiers

Excellent

58 (8.7%)

Very Good

110 (16.4%)

Good

166 (24.8%)

Average

335 (50.1%)

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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