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Marquise|Lab Grown|IGI

0.51ct E SI1 Marquise Lab Grown Diamond

ID • E/SI1 • IGI LG770686841

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG770686841

Diamond specifications and retailer prices

From $227 NZD
HK$1,000 HKD
As of October 30, 2026
Save $447 NZD (66%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,332 NZD at MOH London · As of October 18, 2026
View at MOH London

About this 0.51ct lab-grown marquise diamond

This 0.51ct lab-grown marquise 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 LG770686841 or 770686841. Listed at 16 retailers as of October 28, 2026, with a 197% 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

0.51
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryGood
FluorescenceNone
Crown angle33.1°
Pavilion angle37.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770686841
Dimensions8.17 × 4.21 × 2.55 mm
L/W Ratio1.94
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.17 mm4.21 mm0.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateIGI LG770686841
Side View
Table 56.0%Crown 33.1°Girdle: MED-THKPavilion 37.2°Culet: NoneDepth 60.6%

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: Oct 30
Current: $1,332 NZD|Low: $140 NZD|High: $1,366 NZD|Avg: $435 NZD|-1.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 25, 2026
Retailer 9$145 NZD
Retailer 13$161 NZD
Retailer 8$169 NZD
Retailer 4$192 NZD
Retailer 3$284 NZD
Retailer 2$302 NZD
Retailer 15$348 NZD
Retailer 12$373 NZD
Retailer 6$394 NZD
Retailer 14$461 NZD
Retailer 7$524 NZD
Retailer 11$580 NZD
Retailer 5$594 NZD
Retailer 10$674 NZD
MOH London$1,332 NZD

37 data points across 15 retailers

16 retailers$227 NZD to $674 NZD

Retailer 1
-
$145 NZD
$82 USD
Price last confirmed 8 days ago
A
Retailer 2
-
$169 NZD
$95 USD
View
Price last confirmed 7 days ago
Retailer 3
-
$192 NZD
$108 USD
View
Price last confirmed 12 days ago
A
Retailer 4
-
$227 NZD
HK$1,000 HKD
View
Retailer 5
-
$284 NZD
$160 USD
View
Price last confirmed 13 days ago
A
Retailer 6
-
$302 NZD
£134 GBP
View
A
Retailer 7
-
$348 NZD
€187 EUR
View
B+
Retailer 8
-
$373 NZD
$210 USD
View
Retailer 9
-
$394 NZD
$222 USD
View
Price last confirmed 13 days ago
Retailer 10
-
$461 NZD
£205 GBP
View
Price last confirmed 9 days ago
Retailer 11
-
$524 NZD
SGD 399 SGD
View
Price last confirmed 8 days ago
Retailer 12
-
$580 NZD
$327 USD
View
Price last confirmed 12 days ago
B
Retailer 13
-
$594 NZD
$335 USD
View
Price last confirmed 7 days ago
B
Retailer 14
-
$674 NZD
$380 USD
View
B
Retailer 15
-
$674 NZD
$380 USD
View
Price last confirmed 7 days ago
Most Expensive
MOH London
LG770686841 · Oct 18
$1,332 NZD
£591 GBP
View
Price last confirmed 14 days ago
15 more retailers have this diamond
Prices start from $227 NZDSave up to $447 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 Marquise
$227 NZD