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Radiant|Lab Grown|IGI

1.51ct H SI2 Radiant Lab Grown Diamond

ID • H/SI2 • IGI LG508121542

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

Certificate IGI LG508121542

Diamond specifications and retailer prices

From $1,281 AUD
As of November 6, 2026
Save $5,283 AUD (80%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $6,564 AUD at MOH London · As of November 5, 2026
View at MOH London

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 H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG508121542 or 508121542. Listed at 9 retailers as of November 5, 2026, with prices from $1,281 to $6,564, a $5,283 spread on the same certified stone. MOH London lists it at $6,564. 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
H
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.5°
Pavilion angle28.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG508121542
Dimensions7.41 × 5.78 × 3.74 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
7.41 mm5.78 mm1.51 ctH / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG508121542
Side View
Table 65.5%Crown 37.5°Girdle: Slightly ThickPavilion 28.8°Culet: NoneDepth 64.7%

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: Nov 6
Current: $6,564 AUD|Low: $1,281 AUD|High: $6,669 AUD|Avg: $3,095 AUD|-1.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 2$1,281 AUD
Retailer 3$1,765 AUD
Retailer 7$1,921 AUD
Retailer 4$2,048 AUD
Retailer 9$2,893 AUD
Retailer 5$3,247 AUD
Retailer 6$3,839 AUD
Retailer 8$3,924 AUD
MOH London$6,564 AUD

16 data points across 9 retailers

9 retailers$1,281 AUD to $6,564 AUD

A
Cheapest Retailer
-
$1,281 AUD
B+
Retailer 2
-
$1,765 AUD
View
B+
Retailer 3
-
$1,921 AUD
View
Retailer 4
-
$2,048 AUD
View
Price last confirmed 26 days ago
B+
Retailer 5
-
$2,048 AUD
View
B
Retailer 6
-
$3,247 AUD
View
B
Retailer 7
-
$3,839 AUD
View
B
Retailer 8
-
$3,924 AUD
View
Most Expensive
B
MOH London
LG508121542 · Nov 5
$6,564 AUD
£3,551 GBP
View
8 more retailers have this diamond
Prices start from $1,281 AUDSave up to $5,283 AUD

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
1.51ct Radiant
$1,281 AUD