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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 $1,260 USD
As of November 2, 2026
Save $1,930 USD (61%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $3,381 USD at NZ Jewellers · As of November 1, 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 2, 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
Color
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 2
Current: $2,534 USD|Low: $1,260 USD|High: $5,221 USD|Avg: $2,449 USD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 5$1,260 USD
Retailer 4$1,555 USD
Retailer 8$1,740 USD
Retailer 6$1,804 USD
Retailer 9$1,975 USD
Retailer 1$2,534 USD
Retailer 7$2,839 USD
Retailer 3$3,190 USD
Retailer 2$5,151 USD

42 data points across 9 retailers

12 retailers$1,260 USD to $3,190 USD

B
Cheapest Retailer
-
$1,260 USD
B
Retailer 2
-
$1,555 USD
View
B
Retailer 3
-
$1,692 USD
View
B
Retailer 4
-
$1,740 USD
View
Final sale: no returns
B
Retailer 5
-
$1,804 USD
View
Retailer 6
-
$1,804 USD
View
Price last confirmed 21 days ago
B
Retailer 7
-
$1,975 USD
View
B
Retailer 8
-
$2,534 USD
£1,995 GBP
View
B
Retailer 9
-
$2,839 USD
View
B
Retailer 10
-
$3,190 USD
View
Most Expensive
NZ Jewellers
b3b6622f-1287-4caa-a5ba-c2495b9f7485 · Nov 1
$3,381 USD
View
Price under review
10 more retailers have this diamond
Prices start from $1,260 USDSave up to $1,930 USD

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
$1,260 USD