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Radiant|Lab Grown|IGI

1.51ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG508137718

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

Certificate IGI LG508137718

Diamond specifications and retailer prices

From $1,378 CAD
As of November 6, 2026
Save $3,109 CAD (69%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $4,756 CAD at NZ Jewellers · As of November 6, 2026
View at NZ Jewellers

About this 1.51ct lab-grown radiant diamond

This 1.51ct lab-grown radiant sits in the one-and-a-half to two carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG508137718 or 508137718. Listed at 12 retailers as of November 4, 2026, with a 226% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.51
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.8°
Pavilion angle30.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG508137718
Dimensions7.68 × 5.99 × 3.66 mm
L/W Ratio1.28
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.68 mm5.99 mm1.51 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG508137718
Side View
Table 69.5%Crown 37.8°Girdle: STK-THKPavilion 30.4°Culet: NoneDepth 61.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $3,549 CAD|Low: $1,378 CAD|High: $7,342 CAD|Avg: $3,506 CAD|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3$1,378 CAD
Retailer 5$2,187 CAD
Retailer 8$2,447 CAD
Retailer 6$2,538 CAD
Retailer 1$3,549 CAD
Retailer 7$3,993 CAD
Retailer 4$4,487 CAD
Retailer 2$7,226 CAD

44 data points across 8 retailers

12 retailers$1,378 CAD to $4,487 CAD

B+
Cheapest Retailer
-
$1,378 CAD
B
Retailer 2
-
$2,187 CAD
View
B
Retailer 3
-
$2,380 CAD
View
B
Retailer 4
-
$2,447 CAD
View
Final sale: no returns
Retailer 5
-
$2,538 CAD
View
Price last confirmed 26 days ago
B
Retailer 6
-
$2,538 CAD
View
B
Retailer 7
-
$2,778 CAD
View
B
Retailer 8
-
$3,549 CAD
View
B
Retailer 9
-
$3,993 CAD
View
B
Retailer 10
-
$4,487 CAD
View
Most Expensive
NZ Jewellers
ca34d291-6431-4e06-b846-08ff7aaab054 · Nov 6
$4,756 CAD
$3,381 USD
View
Price under review
10 more retailers have this diamond
Prices start from $1,378 CADSave up to $3,109 CAD

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.

B+
1.51ct Radiant
$1,378 CAD