How much does a 0.75 to 0.99ct D SI1 lab grown asscher diamond cost?

As of October 2026, 0.75 to 0.99ct D SI1 lab grown asscher diamonds typically cost £146 GBP to £535 GBP, with a median price of £357 GBP. There are currently 12 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 asscher diamond?

About 32% of these diamonds are available at multiple retailers, with an average price spread of 70%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Lab Grown Asscher

Quick answer

As of October 2026, there are 12 lab grown asscher diamonds with D colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £146 GBP to £535 GBP, with a median of £357 GBP. At least 25 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 70%. Half of all listings fall between £217 GBP and £452 GBP per carat. The same specification in natural form lists at a median of about £1,695 GBP per carat. Over the last 30 days the median price moved -3.7% and the number of listings moved +31.7%.

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. Asscher lab grown stones in the index: 470 USD per carat, -4.3% 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

£108 GBP

Highest Price

£1,039 GBP

Average Price

£366 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

31.8%

Price Spread

69.8%

30-Day Price Trend

-3.7%

30-Day Supply Change

+31.7%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$447/ct

10th Percentile

$171

Median

$447

90th Percentile

$999

Score Distribution

18 diamonds scored across 4 quality tiers

Excellent

4 (22.2%)

Very Good

3 (16.7%)

Good

7 (38.9%)

Average

4 (22.2%)

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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