How much does a 0.75 to 0.99ct I SI1 lab grown round diamond cost?

As of October 2026, 0.75 to 0.99ct I SI1 lab grown round diamonds typically cost HK$3,708 HKD to HK$11,468 HKD, with a median price of HK$5,437 HKD. There are currently 8 diamonds matching this specification available across retailers.

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

About 15% of these diamonds are available at multiple retailers, with an average price spread of 150%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI1 Lab Grown Round

Quick answer

As of October 2026, there are 8 lab grown round diamonds with I colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$3,708 HKD to HK$11,468 HKD, with a median of HK$5,437 HKD. At least 25 retailers stock this exact specification, and 15% of the stones appear at more than one of them, with an average price spread of 150%. Half of all listings fall between HK$5,991 HKD and HK$22,180 HKD per carat. The same specification in natural form lists at a median of about HK$16,569 HKD per carat. Over the last 30 days the median price moved -36.1% and the number of listings moved -44.3%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

HK$2,693 HKD

Highest Price

HK$29,872 HKD

Average Price

HK$6,452 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

15.5%

Price Spread

150.5%

30-Day Price Trend

-36.1%

30-Day Supply Change

-44.3%

Volatility (30d)

0.14

Price Range

Price per carat distribution across retailers

$1,371/ct

10th Percentile

$356

Median

$1,371

90th Percentile

$4,685

Score Distribution

15 diamonds scored across 4 quality tiers

Excellent

5 (33.3%)

Very Good

6 (40.0%)

Good

3 (20.0%)

Average

1 (6.7%)

Find Your Diamond

Search 8 I SI1 round diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI1J colour is visually identical to I to the naked eye

Save 11%

I SI2SI2 inclusions are not visible without magnification

Save 27%

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