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Radiant|Lab Grown|IGI

1.51ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG499125787

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

Certificate IGI LG499125787

Diamond specifications and retailer prices

From $1,834 AUD
As of November 6, 2026
Save $2,809 AUD (61%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $4,921 AUD 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 LG499125787 or 499125787. Listed at 12 retailers as of November 4, 2026, with a 153% 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
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.2°
Pavilion angle31.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG499125787
Dimensions7.43 × 5.69 × 3.92 mm
L/W Ratio1.31
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
7.43 mm5.69 mm1.51 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG499125787
Side View
Table 68.0%Crown 44.2°Girdle: Slightly ThickPavilion 31.6°Culet: NoneDepth 68.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $3,672 AUD|Low: $1,834 AUD|High: $7,597 AUD|Avg: $3,569 AUD|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 5$1,834 AUD
Retailer 4$2,263 AUD
Retailer 8$2,532 AUD
Retailer 6$2,626 AUD
Retailer 9$2,874 AUD
Retailer 1$3,672 AUD
Retailer 7$4,132 AUD
Retailer 3$4,643 AUD
Retailer 2$7,476 AUD

44 data points across 9 retailers

12 retailers$1,834 AUD to $4,643 AUD

B
Cheapest Retailer
-
$1,834 AUD
B
Retailer 2
-
$2,263 AUD
View
B
Retailer 3
-
$2,463 AUD
View
B
Retailer 4
-
$2,532 AUD
View
Final sale: no returns
B
Retailer 5
-
$2,626 AUD
View
Retailer 6
-
$2,626 AUD
View
Price last confirmed 26 days ago
B
Retailer 7
-
$2,874 AUD
View
B
Retailer 8
-
$3,672 AUD
View
B
Retailer 9
-
$4,132 AUD
View
B
Retailer 10
-
$4,643 AUD
View
Most Expensive
NZ Jewellers
b3b6622f-1287-4caa-a5ba-c2495b9f7485 · Nov 6
$4,921 AUD
$3,381 USD
View
Price under review
10 more retailers have this diamond
Prices start from $1,834 AUDSave up to $2,809 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.

B
1.51ct Radiant
$1,834 AUD