How much does a 5.00ct+ J SI1 lab grown cushion diamond cost?

As of April 2026, 5.00ct+ J SI1 lab grown cushion diamonds are available from £151 GBP to £69,777 GBP, with an average price of £3,335 GBP. There are currently 571 diamonds matching this specification available across retailers.

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5.00ct+ J SI1 Lab Grown Cushion

As of April 2026, there are 571 lab grown cushion diamonds with J color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices range from £151 GBP to £69,777 GBP, with an average of £3,335 GBP.

Last updated: April 2026

Available

571

Lowest Price

£151 GBP

Highest Price

£69,777 GBP

Average Price

£3,335 GBP

Score Distribution

571 diamonds scored across 4 quality tiers

Excellent

26 (4.6%)

Very Good

47 (8.2%)

Good

294 (51.5%)

Average

204 (35.7%)

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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