How much does a 5.00ct+ G SI1 lab grown cushion diamond cost?

As of October 2026, 5.00ct+ G SI1 lab grown cushion diamonds typically cost $968 SGD to $8,807 SGD, with a median price of $2,983 SGD. There are currently 19 diamonds matching this specification available across retailers.

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

About 48% of these diamonds are available at multiple retailers, with an average price spread of 125%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 19 lab grown cushion diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $968 SGD to $8,807 SGD, with a median of $2,983 SGD. At least 17 retailers stock this exact specification, and 48% of the stones appear at more than one of them, with an average price spread of 125%. Half of all listings fall between $327 SGD and $893 SGD per carat. The same specification in natural form lists at a median of about $24,590 SGD per carat. Over the last 30 days the median price moved -11.8% and the number of listings moved +16.7%.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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

$773 SGD

Highest Price

$46,063 SGD

Average Price

$5,249 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

47.8%

Price Spread

124.9%

30-Day Price Trend

-11.8%

30-Day Supply Change

+16.7%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$354/ct

10th Percentile

$208

Median

$354

90th Percentile

$974

Score Distribution

31 diamonds scored across 3 quality tiers

Excellent

11 (35.5%)

Good

13 (41.9%)

Average

7 (22.6%)

Find Your Diamond

Search 19 G SI1 cushion diamonds and compare prices.

Search Diamonds

Consider Instead

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

G SI2SI2 inclusions are not visible without magnification

Save 24%

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