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

As of October 2026, 0.75 to 0.99ct I SI1 lab grown oval diamonds typically cost HK$4,872 HKD to HK$10,898 HKD, with a median price of HK$5,178 HKD. There are currently 13 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 132%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 13 lab grown oval diamonds with I colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$4,872 HKD to HK$10,898 HKD, with a median of HK$5,178 HKD. At least 17 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 132%. Half of all listings fall between HK$7,211 HKD and HK$18,286 HKD per carat. The same specification in natural form lists at a median of about HK$13,964 HKD per carat. Over the last 30 days the median price moved -4.6% and the number of listings moved -4.0%.

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. Oval lab grown stones in the index: 453 USD per carat, -7.4% 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$3,547 HKD

Highest Price

HK$28,077 HKD

Average Price

HK$7,696 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

35.9%

Price Spread

131.8%

30-Day Price Trend

-4.6%

30-Day Supply Change

-4.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,071/ct

10th Percentile

$698

Median

$1,071

90th Percentile

$3,205

Score Distribution

22 diamonds scored across 3 quality tiers

Excellent

11 (50.0%)

Very Good

1 (4.5%)

Average

10 (45.5%)

Find Your Diamond

Search 13 I SI1 oval 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 21%

I SI2SI2 inclusions are not visible without magnification

Save 21%

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