How much does a 1.50 to 1.99ct I VS1 natural cushion diamond cost?

As of October 2026, 1.50 to 1.99ct I VS1 natural cushion diamonds typically cost £2,775 GBP to £7,553 GBP, with a median price of £4,375 GBP. There are currently 426 diamonds matching this specification available across retailers.

Where can I find the best price on a I VS1 cushion diamond?

About 30% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I VS1 Natural Cushion

Quick answer

As of October 2026, there are 426 natural cushion diamonds with I colour and VS1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,775 GBP to £7,553 GBP, with a median of £4,375 GBP. At least 61 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between £2,551 GBP and £4,389 GBP per carat. The same specification in lab grown form lists at a median of about £431 GBP per carat. Over the last 30 days the median price moved -1.0% and the number of listings moved +5.7%.

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

426

Lowest Price

£1,817 GBP

Highest Price

£15,644 GBP

Average Price

£4,861 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

30.3%

Price Spread

55.3%

30-Day Price Trend

-1.0%

30-Day Supply Change

+5.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$4,427/ct

10th Percentile

$2,758

Median

$4,427

90th Percentile

$7,216

Score Distribution

1.2K diamonds scored across 4 quality tiers

Excellent

235 (19.6%)

Very Good

295 (24.7%)

Good

317 (26.5%)

Average

349 (29.2%)

Find Your Diamond

Search 426 I VS1 cushion diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J VS1J colour is visually identical to I to the naked eye

Save 32%

Lab-Grown I VS1Same specifications, lab-grown origin

Save 87%

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