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Cushion|Lab Grown|IGI

4.09ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG677556271

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG677556271

Diamond specifications and retailer prices

From HK$3,826 HKD
£384 GBP
As of November 2, 2026
Save HK$14,730 HKD (79%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: HK$18,556 HKD at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 4.09ct lab-grown cushion diamond

This 4.09ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG677556271 or 677556271. Listed at 10 retailers as of October 28, 2026, with prices from HK$3,826 to HK$18,556, a HK$14,730 spread on the same certified stone. Rare Carat lists it at HK$18,556. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

4.09
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle38.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG677556271
Dimensions10.61 × 8.73 × 5.91 mm
L/W Ratio1.22
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.61 mm8.73 mm4.09 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG677556271
Side View
Table 61.0%Crown 33.8°Girdle: MED-STKPavilion 38.2°Culet: NoneDepth 67.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: HK$27,434 HKD|Low: HK$3,826 HKD|High: HK$45,194 HKD|Avg: HK$15,163 HKD
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 2HK$3,826 HKD
Retailer 10HK$4,921 HKD
Retailer 7HK$5,571 HKD
Retailer 6HK$6,706 HKD
Retailer 12HK$6,952 HKD
Retailer 9HK$7,140 HKD
Retailer 5HK$7,282 HKD
Retailer 11HK$9,164 HKD
Retailer 8HK$16,382 HKD
Rare CaratHK$27,434 HKD
Retailer 3HK$37,209 HKD
Retailer 4HK$45,194 HKD

6 data points across 12 retailers

10 retailersHK$3,826 HKD to HK$18,556 HKD

A
Cheapest Retailer
-
HK$3,826 HKD
£384 GBP
A
Retailer 2
-
HK$4,921 HKD
View
A
Retailer 3
-
HK$5,571 HKD
$710 USD
View
A
Retailer 4
-
HK$6,706 HKD
€814 EUR
View
B+
Retailer 5
-
HK$6,952 HKD
$886 USD
View
A
Retailer 6
-
HK$7,140 HKD
$910 USD
View
A
Retailer 7
-
HK$7,282 HKD
£731 GBP
View
A
Retailer 8
-
HK$9,164 HKD
$1,168 USD
View
B
Retailer 9
-
HK$16,382 HKD
£1,644 GBP
View
Most Expensive
B
Rare Carat
KI2715562KF677 · Oct 28
HK$18,556 HKD
$2,365 USD
View
9 more retailers have this diamond
Prices start from HK$3,826 HKDSave up to HK$14,730 HKD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
4.09ct Cushion
HK$3,826 HKD