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

As of September 2026, 1.00 to 1.49ct I IF natural cushion diamonds typically cost £1,126 GBP to £3,415 GBP, with a median price of £1,682 GBP. There are currently 109 diamonds matching this specification available across retailers.

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1.00 to 1.49ct I IF Natural Cushion

Quick answer

As of September 2026, there are 109 natural cushion diamonds with I colour and IF clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,126 GBP to £3,415 GBP, with a median of £1,682 GBP. At least 46 retailers stock this exact specification. Half of all listings fall between £1,576 GBP and £2,528 GBP per carat. The same specification in lab grown form lists at a median of about £1,848 GBP per carat.

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

109

Lowest Price

£833 GBP

Highest Price

£6,217 GBP

Average Price

£2,063 GBP

Market Intelligence

Retailers Selling

Price Spread

48.8%

Price Range

Price per carat distribution across retailers

$2,636/ct

10th Percentile

$1,801

Median

$2,636

90th Percentile

$4,372

Score Distribution

109 diamonds scored across 4 quality tiers

Excellent

30 (27.5%)

Very Good

24 (22.0%)

Good

41 (37.6%)

Average

14 (12.8%)

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J IFJ colour is visually identical to I to the naked eye

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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