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0.51ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG781612518

Shape and cutting style on the report: Round brilliant

Certificate IGI LG781612518

Diamond specifications and retailer prices

From $267 NZD
As of November 4, 2026
Save $1,242 NZD (82%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $1,509 NZD at MOH London · As of November 4, 2026
View at MOH London

About this 0.51ct lab-grown round diamond

This 0.51ct lab-grown round sits in the half to three-quarter carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG781612518 or 781612518. Listed at 8 retailers as of November 4, 2026, with prices from $267 to $1,509, a $1,242 spread on the same certified stone. MOH London lists it at $1,509. 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

0.51
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG781612518
Dimensions5.11 × 5.07 × 3.15 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
5.11 mm5.07 mm0.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG781612518
Side View
Table 60.0%Crown 36.1°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 61.9%

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 4
Current: $1,509 NZD|Low: $267 NZD|High: $1,520 NZD|Avg: $607 NZD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3$267 NZD
Retailer 2$382 NZD
Retailer 4$429 NZD
Retailer 6$430 NZD
Retailer 8$463 NZD
Retailer 5$619 NZD
Retailer 7$767 NZD
MOH London$1,509 NZD

42 data points across 8 retailers

8 retailers$267 NZD to $1,509 NZD

A
Cheapest Retailer
-
$267 NZD
A
Retailer 2
-
$382 NZD
View
B+
Retailer 3
-
$429 NZD
View
B+
Retailer 4
-
$430 NZD
View
B+
Retailer 5
-
$463 NZD
View
B
Retailer 6
-
$619 NZD
View
B
Retailer 7
-
$767 NZD
View
Most Expensive
B
MOH London
LG781612518 · Nov 4
$1,509 NZD
£668 GBP
View
7 more retailers have this diamond
Prices start from $267 NZDSave up to $1,242 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
0.51ct Round
$267 NZD