How much does a 0.75 to 0.99ct J SI1 natural cushion diamond cost?

As of October 2026, 0.75 to 0.99ct J SI1 natural cushion diamonds typically cost HK$5,120 HKD to HK$16,153 HKD, with a median price of HK$8,858 HKD. There are currently 121 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 69%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI1 Natural Cushion

Quick answer

As of October 2026, there are 121 natural cushion diamonds with J colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$5,120 HKD to HK$16,153 HKD, with a median of HK$8,858 HKD. At least 53 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 69%. Half of all listings fall between HK$8,457 HKD and HK$16,695 HKD per carat. Over the last 30 days the median price moved +1.5% and the number of listings moved +2.0%.

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

121

Lowest Price

HK$2,746 HKD

Highest Price

HK$35,612 HKD

Average Price

HK$9,839 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

34.7%

Price Spread

68.5%

30-Day Price Trend

+1.5%

30-Day Supply Change

+2.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,532/ct

10th Percentile

$829

Median

$1,532

90th Percentile

$2,701

Score Distribution

307 diamonds scored across 4 quality tiers

Excellent

40 (13.0%)

Very Good

52 (16.9%)

Good

111 (36.2%)

Average

104 (33.9%)

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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