Radiant|Lab Grown|IGI

3.50ct E SI1 Radiant Lab Grown Diamond

EX • E/SI1 • IGI LG778683675

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG778683675

Diamond specifications and retailer prices

From $485 USD
As of October 30, 2026
Save $3,295 USD (87%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $3,780 USD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.5ct lab-grown radiant diamond

This 3.5ct lab-grown radiant 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 LG778683675 or 778683675. Listed at 19 retailers as of October 29, 2026, with prices from $485 to $3,780, a $3,295 spread on the same certified stone. Brilliant Earth lists it at $3,780. 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

3.50
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.2°
Pavilion angle33.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778683675
Dimensions11.07 × 7.38 × 4.98 mm
L/W Ratio1.50
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.07 mm7.38 mm3.50 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778683675
Side View
Table 66.0%Crown 42.2°Girdle: MediumPavilion 33.5°Culet: NoneDepth 67.5%

Caratlytics Score

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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: Oct 30
Current: $3,780 USD|Low: $465 USD|High: $4,170 USD|Avg: $1,442 USD|+2.2%
Brilliant Earth
Retailer 2
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Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
October 30, 2026
Retailer 18$485 USD
Retailer 10$542 USD
Retailer 16$543 USD
Retailer 5$601 USD
Retailer 8$601 USD
Retailer 11$740 USD
Retailer 7$797 USD
Retailer 15$812 USD
Retailer 9$989 USD
Retailer 2$1,033 USD
Retailer 12$1,174 USD
Retailer 6$1,616 USD
Retailer 17$1,745 USD
Retailer 14$2,262 USD
Retailer 4$2,655 USD
Retailer 3$2,785 USD
Retailer 13$3,009 USD
Brilliant Earth$3,780 USD

41 data points across 18 retailers

19 retailers$485 USD to $3,780 USD

A
Cheapest Retailer
-
$485 USD
A
Retailer 2
-
$542 USD
View
Final sale: no returns
A
Retailer 3
-
$543 USD
View
A
Retailer 4
-
$601 USD
View
Retailer 5
-
$601 USD
View
Price last confirmed 14 days ago
A
Retailer 6
-
$740 USD
View
B+
Retailer 7
-
$797 USD
View
Retailer 8
-
$812 USD
£640 GBP
View
Price last confirmed 8 days ago
A
Retailer 9
-
$989 USD
View
A
Retailer 10
-
$1,033 USD
£814 GBP
View
A
Retailer 11
-
$1,174 USD
View
B+
Retailer 12
-
$1,478 USD
View
B+
Retailer 13
-
$1,616 USD
View
B+
Retailer 14
-
$1,745 USD
View
B
Retailer 15
-
$2,262 USD
View
Retailer 16
-
$2,655 USD
View
Price last confirmed 11 days ago
B
Retailer 17
-
$2,785 USD
£2,193 GBP
View
B
Retailer 18
-
$3,009 USD
View
Most Expensive
B
Brilliant Earth
19844448A · Oct 29
$3,780 USD
View
18 more retailers have this diamond
Prices start from $485 USDSave up to $3,295 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
3.50ct Radiant
$485 USD