How much does a 3.00 to 4.99ct J SI1 lab grown cushion diamond cost?

As of October 2026, 3.00 to 4.99ct J SI1 lab grown cushion diamonds typically cost ₹3,73,353 INR to ₹30,00,469 INR, with a median price of ₹17,57,327 INR. There are currently 5 diamonds matching this specification available across retailers.

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

About 56% of these diamonds are available at multiple retailers, with an average price spread of 98%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 5 lab grown cushion diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run ₹3,73,353 INR to ₹30,00,469 INR, with a median of ₹17,57,327 INR. At least 9 retailers stock this exact specification, and 56% of the stones appear at more than one of them, with an average price spread of 98%. Half of all listings fall between ₹51,413 INR and ₹2,23,897 INR per carat. The same specification in natural form lists at a median of about ₹7,98,492 INR per carat.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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

₹2,39,002 INR

Highest Price

₹30,54,658 INR

Average Price

₹17,10,383 INR

Market Intelligence

Retailers Selling

Cross Retailer %

55.6%

Price Spread

98.4%

Price Range

Price per carat distribution across retailers

$1,841/ct

10th Percentile

$400

Median

$1,841

90th Percentile

$3,013

Score Distribution

6 diamonds scored across 2 quality tiers

Very Good

1 (16.7%)

Good

5 (83.3%)

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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