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Radiant|Lab Grown|IGI

1.51ct E IF Radiant Lab Grown Diamond

EX • E/IF • IGI LG816657809

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

Certificate IGI LG816657809

Diamond specifications and retailer prices

From $1,041 NZD
€559 EUR
As of October 31, 2026
Save $1,516 NZD (59%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $4,037 NZD at Rare Carat · As of October 18, 2026
View at Rare Carat

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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816657809 or 816657809. Listed at 9 retailers as of October 31, 2026, with a 146% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
E
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle27.2°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816657809
Dimensions8.03 × 5.73 × 3.81 mm
L/W Ratio1.40
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
8.03 mm5.73 mm1.51 ctE / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816657809
Side View
Table 66.0%Crown 27.2°Girdle: Slightly ThickPavilion 35.6°Culet: NoneDepth 66.5%

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: Oct 31
Current: $4,037 NZD|Low: $861 NZD|High: $4,090 NZD|Avg: $1,809 NZD|+4.8%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 4$1,041 NZD
Retailer 5$1,049 NZD
Retailer 6$1,100 NZD
Retailer 3$1,129 NZD
Retailer 8$1,796 NZD
Retailer 7$1,961 NZD
Retailer 2$2,558 NZD
Rare Carat$4,037 NZD

43 data points across 8 retailers

9 retailers$1,041 NZD to $2,558 NZD

A
Cheapest Retailer
-
$1,041 NZD
€559 EUR
A
Retailer 2
-
$1,049 NZD
$591 USD
View
A
Retailer 3
-
$1,100 NZD
$620 USD
View
A
Retailer 4
-
$1,129 NZD
£501 GBP
View
B+
Retailer 5
-
$1,796 NZD
$1,012 USD
View
B+
Retailer 6
-
$2,001 NZD
$1,128 USD
View
B+
Retailer 7
-
$2,138 NZD
$1,205 USD
View
B+
Retailer 8
-
$2,558 NZD
£1,135 GBP
View
Most Expensive
Rare Carat
NV54-113A · Oct 18
$4,037 NZD
$2,275 USD
View
Price last confirmed 13 days ago
8 more retailers have this diamond
Prices start from $1,041 NZDSave up to $1,516 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.

A
1.51ct Radiant
$1,041 NZD