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Round|Lab Grown|IGI

1.51ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG478109508

Shape and cutting style on the report: Round brilliant

Certificate IGI LG478109508

Diamond specifications and retailer prices

From $354 NZD
As of November 1, 2026
Save $1,060 NZD (75%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $2,060 NZD at MOH London · As of October 29, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG478109508 or 478109508. Listed at 15 retailers as of November 1, 2026, with a 299% 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.7°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG478109508
Dimensions7.53 × 7.49 × 4.38 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
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
7.53 mm7.49 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG478109508
Side View
Table 59.0%Crown 32.7°Girdle: MediumPavilion 40.1°Culet: NoneDepth 58.2%

Caratlytics Score

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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 1
Current: $2,060 NZD|Low: $340 NZD|High: $5,063 NZD|Avg: $828 NZD|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 7$354 NZD
Retailer 10$397 NZD
Retailer 3$438 NZD
Retailer 9$438 NZD
Retailer 8$578 NZD
Retailer 2$733 NZD
Retailer 4$801 NZD
Retailer 11$895 NZD
Retailer 5$1,379 NZD
Retailer 6$1,414 NZD
MOH London$2,060 NZD

42 data points across 11 retailers

15 retailers$354 NZD to $1,414 NZD

A
Cheapest Retailer
-
$354 NZD
A
Retailer 2
-
$397 NZD
View
Final sale: no returns
A
Retailer 3
-
$411 NZD
View
Retailer 4
-
$438 NZD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$438 NZD
View
A
Retailer 6
-
$500 NZD
View
B+
Retailer 7
-
$578 NZD
View
A
Retailer 8
-
$733 NZD
View
A
Retailer 9
-
$779 NZD
View
A
Retailer 10
-
$801 NZD
View
B+
Retailer 11
-
$895 NZD
View
B+
Retailer 12
-
$1,379 NZD
View
B+
Retailer 13
-
$1,409 NZD
View
B+
Retailer 14
-
$1,414 NZD
View
Most Expensive
MOH London
LG478109508 · Oct 29
$2,060 NZD
£912 GBP
View
Price last confirmed 8 days ago
14 more retailers have this diamond
Prices start from $354 NZDSave up to $1,060 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
$354 NZD