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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 $2,273 NZD
As of November 6, 2026
Save $3,482 NZD (61%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $6,099 NZD 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $4,551 NZD|Low: $2,273 NZD|High: $9,416 NZD|Avg: $4,423 NZD|-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$2,273 NZD
Retailer 4$2,805 NZD
Retailer 8$3,139 NZD
Retailer 6$3,254 NZD
Retailer 9$3,563 NZD
Retailer 1$4,551 NZD
Retailer 7$5,121 NZD
Retailer 3$5,754 NZD
Retailer 2$9,267 NZD

44 data points across 9 retailers

12 retailers$2,273 NZD to $5,754 NZD

B
Cheapest Retailer
-
$2,273 NZD
B
Retailer 2
-
$2,805 NZD
View
B
Retailer 3
-
$3,052 NZD
View
B
Retailer 4
-
$3,139 NZD
View
Final sale: no returns
B
Retailer 5
-
$3,254 NZD
View
Retailer 6
-
$3,254 NZD
View
Price last confirmed 26 days ago
B
Retailer 7
-
$3,563 NZD
View
B
Retailer 8
-
$4,551 NZD
View
B
Retailer 9
-
$5,121 NZD
View
B
Retailer 10
-
$5,754 NZD
View
Most Expensive
NZ Jewellers
b3b6622f-1287-4caa-a5ba-c2495b9f7485 · Nov 6
$6,099 NZD
$3,381 USD
View
Price under review
10 more retailers have this diamond
Prices start from $2,273 NZDSave up to $3,482 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.

B
1.51ct Radiant
$2,273 NZD