CaratHunter
Plans
Cushion|Lab Grown|IGI

3.51ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG823696410

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG823696410

Diamond specifications and retailer prices

From $576 USD
HK$4,500 HKD
As of October 30, 2026
Save $2,204 USD (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,780 USD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 3.51ct lab-grown cushion diamond

This 3.51ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG823696410 or 823696410. Listed at 12 retailers as of October 30, 2026, with prices from $576 to $2,780, a $2,204 spread on the same certified stone. Brilliant Earth lists it at $2,780. 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

3.51
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG823696410
Dimensions10.54 × 7.56 × 5.12 mm
L/W Ratio1.39
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.54 mm7.56 mm3.51 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG823696410
Side View
Table 63.0%Crown 36.3°Girdle: MED-THKPavilion 36.4°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: Oct 30
Current: $2,780 USD|Low: $487 USD|High: $5,240 USD|Avg: $1,557 USD|-46.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 5$487 USD
Retailer 2$576 USD
Retailer 9$664 USD
Retailer 8$685 USD
Retailer 6$820 USD
Retailer 3$851 USD
Retailer 10$887 USD
Retailer 13$1,308 USD
Retailer 4$1,359 USD
Retailer 7$1,698 USD
Retailer 11$1,989 USD
Retailer 12$2,690 USD
Brilliant Earth$2,780 USD

40 data points across 13 retailers

12 retailers$576 USD to $2,780 USD

A
Cheapest Retailer
-
$576 USD
HK$4,500 HKD
A
Retailer 2
-
$664 USD
£523 GBP
View
A
Retailer 3
-
$685 USD
View
A
Retailer 4
-
$820 USD
€781 EUR
View
B+
Retailer 5
-
$851 USD
View
A
Retailer 6
-
$887 USD
£699 GBP
View
B+
Retailer 7
-
$1,308 USD
View
B+
Retailer 8
-
$1,359 USD
View
B+
Retailer 9
-
$1,698 USD
SGD 2,295 SGD
View
B+
Retailer 10
-
$1,989 USD
£1,566 GBP
View
B
Retailer 11
-
$2,690 USD
View
Most Expensive
B
Brilliant Earth
20881638A · Oct 30
$2,780 USD
View
11 more retailers have this diamond
Prices start from $576 USDSave up to $2,204 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
3.51ct Cushion
$576 USD