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Cushion|Lab Grown|IGI

3.55ct F SI1 Cushion Lab Grown Diamond

EX • F/SI1 • IGI LG689555131

Shape and cutting style on the report: Rectangular cushion mixed cut

Certificate IGI LG689555131

Diamond specifications and retailer prices

From $540 USD
As of November 1, 2026
Save $1,963 USD (78%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,503 USD at MOH London · As of November 1, 2026
View at MOH London

About this 3.55ct lab-grown cushion diamond

This 3.55ct 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 LG689555131 or 689555131. Listed at 12 retailers as of November 1, 2026, with prices from $540 to $2,503, a $1,963 spread on the same certified stone. MOH London lists it at $2,503. 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

3.55
Carat
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle30.4°
Pavilion angle35.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG689555131
Dimensions11.47 × 7.29 × 4.26 mm
L/W Ratio1.57
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.47 mm7.29 mm3.55 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG689555131
Side View
Table 66.0%Crown 30.4°Girdle: MED-STKPavilion 35.8°Culet: LargeDepth 58.4%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: $2,503 USD|Low: $540 USD|High: $2,532 USD|Avg: $1,312 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 9$540 USD
Retailer 6$740 USD
Retailer 4$805 USD
Retailer 5$903 USD
Retailer 11$915 USD
Retailer 2$996 USD
Retailer 3$1,331 USD
Retailer 7$1,389 USD
Retailer 10$1,902 USD
Retailer 8$2,098 USD
MOH London$2,503 USD

38 data points across 11 retailers

12 retailers$540 USD to $2,503 USD

A
Cheapest Retailer
-
$540 USD
Final sale: no returns
A
Retailer 2
-
$740 USD
View
B+
Retailer 3
-
$805 USD
View
A
Retailer 4
-
$903 USD
€860 EUR
View
A
Retailer 5
-
$915 USD
View
A
Retailer 6
-
$996 USD
£784 GBP
View
B+
Retailer 7
-
$1,331 USD
View
B+
Retailer 8
-
$1,389 USD
View
B
Retailer 9
-
$1,902 USD
SGD 2,570 SGD
View
B
Retailer 10
-
$1,955 USD
View
B+
Retailer 11
-
$2,098 USD
View
Most Expensive
B
MOH London
LG689555131 · Nov 1
$2,503 USD
£1,971 GBP
View
11 more retailers have this diamond
Prices start from $540 USDSave up to $1,963 USD

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
3.55ct Cushion
$540 USD