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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 $671 NZD
$378 USD
As of October 29, 2026
Save $2,771 NZD (81%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $3,442 NZD 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 $671 to $3,442, a $2,771 spread on the same certified stone. Rare Carat lists it at $3,442. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $3,442 NZD|Low: $671 NZD|High: $8,747 NZD|Avg: $2,784 NZD|-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$671 NZD
Retailer 9$751 NZD
Retailer 2$1,334 NZD
Retailer 14$1,423 NZD
Retailer 6$1,961 NZD
Retailer 4$2,055 NZD
Retailer 3$2,188 NZD
Retailer 10$2,331 NZD
Retailer 8$2,333 NZD
Retailer 12$2,672 NZD
Retailer 7$3,252 NZD
Retailer 13$3,322 NZD
Rare Carat$3,442 NZD
Retailer 5$8,747 NZD

27 data points across 14 retailers

9 retailers$671 NZD to $3,442 NZD

A
Cheapest Retailer
-
$671 NZD
$378 USD
A
Retailer 2
-
$751 NZD
$423 USD
View
A
Retailer 3
-
$1,334 NZD
€716 EUR
View
B+
Retailer 4
-
$2,331 NZD
$1,314 USD
View
B+
Retailer 5
-
$2,333 NZD
$1,315 USD
View
B+
Retailer 6
-
$2,672 NZD
$1,506 USD
View
B+
Retailer 7
-
$3,252 NZD
£1,443 GBP
View
Retailer 8
-
$3,322 NZD
SGD 2,530 SGD
View
Price last confirmed 17 days ago
Most Expensive
B
Rare Carat
LGRD30-86336 · Oct 28
$3,442 NZD
$1,940 USD
View
8 more retailers have this diamond
Prices start from $671 NZDSave up to $2,771 NZD

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
$671 NZD