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1.51ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451056217

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056217

Diamond specifications and retailer prices

From $1,494 NZD
As of November 5, 2026
Save $7,613 NZD (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $9,107 NZD at MOH London · As of November 3, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056217 or 451056217. Listed at 11 retailers as of November 3, 2026, with prices from $1,494 to $9,107, a $7,613 spread on the same certified stone. MOH London lists it at $9,107. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056217
Dimensions7.32 × 7.40 × 4.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.32 mm7.40 mm1.51 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056217
Side View
Table 61.0%Crown 36°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $9,107 NZD|Low: $1,494 NZD|High: $9,229 NZD|Avg: $4,531 NZD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2$1,494 NZD
Retailer 3$2,444 NZD
Retailer 6$2,734 NZD
Retailer 4$2,834 NZD
Retailer 7$3,140 NZD
Retailer 9$3,878 NZD
Retailer 5$4,477 NZD
Retailer 8$5,283 NZD
Retailer 10$8,112 NZD
MOH London$9,107 NZD

14 data points across 10 retailers

11 retailers$1,494 NZD to $9,107 NZD

A
Cheapest Retailer
-
$1,494 NZD
B+
Retailer 2
-
$2,444 NZD
View
B+
Retailer 3
-
$2,658 NZD
View
B+
Retailer 4
-
$2,734 NZD
View
Final sale: no returns
B+
Retailer 5
-
$2,834 NZD
View
Retailer 6
-
$2,834 NZD
View
Price last confirmed 25 days ago
B
Retailer 7
-
$3,140 NZD
View
B
Retailer 8
-
$4,477 NZD
View
B
Retailer 9
-
$5,283 NZD
View
B
Retailer 10
-
$5,314 NZD
View
Most Expensive
B
MOH London
LG451056217 · Nov 3
$9,107 NZD
£4,031 GBP
View
10 more retailers have this diamond
Prices start from $1,494 NZDSave up to $7,613 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
$1,494 NZD