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Round|Lab Grown|IGI

3.51ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG670420051

Shape and cutting style on the report: Round brilliant

Certificate IGI LG670420051

Diamond specifications and retailer prices

From $378 USD
As of October 29, 2026
Save $1,562 USD (81%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $1,940 USD at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 3.51ct lab-grown round diamond

This 3.51ct lab-grown round 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 LG670420051 or 670420051. Listed at 9 retailers as of October 28, 2026, with prices from $378 to $1,940, a $1,562 spread on the same certified stone. Rare Carat lists it at $1,940. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG670420051
Dimensions9.88 × 9.85 × 5.89 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
HEARTS & ARROWS This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.88 mm9.85 mm3.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG670420051
Side View
Table 58.0%Crown 33.5°Girdle: MediumPavilion 40.5°Culet: NoneDepth 59.7%

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: Oct 29
Current: $1,940 USD|Low: $378 USD|High: $4,930 USD|Avg: $1,569 USD|-0.9%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 29, 2026
Retailer 11$378 USD
Retailer 9$423 USD
Retailer 2$752 USD
Retailer 14$802 USD
Retailer 6$1,105 USD
Retailer 4$1,158 USD
Retailer 3$1,233 USD
Retailer 10$1,314 USD
Retailer 8$1,315 USD
Retailer 12$1,506 USD
Retailer 7$1,833 USD
Retailer 13$1,872 USD
Rare Carat$1,940 USD
Retailer 5$4,930 USD

27 data points across 14 retailers

9 retailers$378 USD to $1,940 USD

A
Cheapest Retailer
-
$378 USD
A
Retailer 2
-
$423 USD
View
A
Retailer 3
-
$752 USD
€716 EUR
View
B+
Retailer 4
-
$1,314 USD
View
B+
Retailer 5
-
$1,315 USD
View
B+
Retailer 6
-
$1,506 USD
View
B+
Retailer 7
-
$1,833 USD
£1,443 GBP
View
B
Retailer 8
-
$1,872 USD
SGD 2,530 SGD
View
Price last confirmed 16 days ago
Most Expensive
B
Rare Carat
LGRD30-86336 · Oct 28
$1,940 USD
View
8 more retailers have this diamond
Prices start from $378 USDSave up to $1,562 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 Round
$378 USD