Radiant|Lab Grown|IGI

1.51ct D SI1 Radiant Lab Grown Diamond

EX • D/SI1

Diamond specifications and retailer prices

From $484 USD
As of November 6, 2026
Save $1,445 USD (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,929 USD 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI. Listed at 5 retailers as of November 6, 2026, with prices from $484 to $1,929, a $1,445 spread on the same certified stone. NZ Jewellers lists it at $1,929. 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
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.28 × 5.64 × 3.87 mm
L/W Ratio1.29
Top View
7.28 mm5.64 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 66.5%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 68.6%

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: $1,929 USD|Low: $347 USD|High: $1,929 USD|Avg: $753 USD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7$347 USD
Retailer 5$484 USD
Retailer 4$542 USD
Retailer 3$600 USD
Retailer 2$664 USD
Retailer 6$1,119 USD
NZ Jewellers$1,929 USD

39 data points across 7 retailers

5 retailers$484 USD to $1,929 USD

A
Cheapest Retailer
-
$484 USD
B+
Retailer 2
-
$542 USD
View
B+
Retailer 3
-
$600 USD
View
B+
Retailer 4
-
$664 USD
View
Most Expensive
C
NZ Jewellers
6ee64d95-f7fd-4ec1-bf28-e54896464641 · Nov 6
$1,929 USD
View
4 more retailers have this diamond
Prices start from $484 USDSave up to $1,445 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.

A
1.51ct Radiant
$484 USD