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1.51ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG451055677

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055677

Diamond specifications and retailer prices

From $1,672 NZD
As of November 5, 2026
Save $4,889 NZD (75%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $6,561 NZD at MOH London · As of November 5, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451055677 or 451055677. Listed at 10 retailers as of November 5, 2026, with prices from $1,672 to $6,561, a $4,889 spread on the same certified stone. MOH London lists it at $6,561. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055677
Dimensions7.26 × 7.31 × 4.57 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.26 mm7.31 mm1.51 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055677
Side View
Table 58.0%Crown 36.1°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.7%

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 5
Current: $6,561 NZD|Low: $1,605 NZD|High: $6,667 NZD|Avg: $3,161 NZD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 5$1,672 NZD
Retailer 6$1,939 NZD
Retailer 8$1,939 NZD
Retailer 2$2,122 NZD
Retailer 3$2,250 NZD
Retailer 9$2,855 NZD
Retailer 7$3,106 NZD
Retailer 4$4,180 NZD
MOH London$6,561 NZD

28 data points across 9 retailers

10 retailers$1,672 NZD to $6,561 NZD

A
Cheapest Retailer
-
$1,672 NZD
A
Retailer 2
-
$1,820 NZD
View
Retailer 3
-
$1,939 NZD
View
Price last confirmed 25 days ago
A
Retailer 4
-
$1,939 NZD
View
A
Retailer 5
-
$2,122 NZD
View
B+
Retailer 6
-
$2,250 NZD
View
B
Retailer 7
-
$3,106 NZD
View
B
Retailer 8
-
$4,180 NZD
View
B
Retailer 9
-
$5,454 NZD
View
Most Expensive
B
MOH London
LG451055677 · Nov 5
$6,561 NZD
£2,904 GBP
View
9 more retailers have this diamond
Prices start from $1,672 NZDSave up to $4,889 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 Round
$1,672 NZD