Where can I find the best price on a G SI2 marquise diamond?

About 100% of these diamonds are available at multiple retailers, with an average price spread of 80%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI2 Lab Grown Marquise

Quick answer

At least 10 retailers stock this exact specification, and 100% of the stones appear at more than one of them, with an average price spread of 80%. Half of all listings fall between HK$1,444 HKD and HK$2,939 HKD per carat. The same specification in natural form lists at a median of about HK$150,492 HKD per carat. Over the last 30 days the median price moved -16.1% and the number of listings moved +44.3%.

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. Marquise lab grown stones in the index: 485 USD per carat, -3.2% 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

Market Intelligence

Retailers Selling

Cross Retailer %

100.0%

Price Spread

80.1%

30-Day Price Trend

-16.1%

30-Day Supply Change

+44.3%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$238/ct

10th Percentile

$143

Median

$238

90th Percentile

$568

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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