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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 $135 AUD
$95 USD
As of October 24, 2026
Save $406 AUD (75%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,069 AUD 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 24, 2026, with a 300% 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 24
Current: $1,069 AUD|Low: $112 AUD|High: $1,096 AUD|Avg: $349 AUD|-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$117 AUD
Retailer 13$130 AUD
Retailer 8$135 AUD
Retailer 4$154 AUD
Retailer 3$228 AUD
Retailer 2$242 AUD
Retailer 15$280 AUD
Retailer 12$299 AUD
Retailer 6$316 AUD
Retailer 14$370 AUD
Retailer 7$420 AUD
Retailer 11$466 AUD
Retailer 5$477 AUD
Retailer 10$541 AUD
MOH London$1,069 AUD

38 data points across 15 retailers

16 retailers$135 AUD to $541 AUD

Retailer 1
-
$117 AUD
$82 USD
Price last confirmed 8 days ago
A
Retailer 2
-
$135 AUD
$95 USD
View
Retailer 3
-
$154 AUD
$108 USD
View
Price last confirmed 11 days ago
A
Retailer 4
-
$182 AUD
HK$1,000 HKD
View
Retailer 5
-
$228 AUD
$160 USD
View
Price last confirmed 13 days ago
A
Retailer 6
-
$242 AUD
£134 GBP
View
A
Retailer 7
-
$280 AUD
€187 EUR
View
B+
Retailer 8
-
$299 AUD
$210 USD
View
Retailer 9
-
$316 AUD
$222 USD
View
Price last confirmed 13 days ago
Retailer 10
-
$370 AUD
£205 GBP
View
Price last confirmed 8 days ago
Retailer 11
-
$420 AUD
SGD 399 SGD
View
Price last confirmed 7 days ago
Retailer 12
-
$466 AUD
$327 USD
View
Price last confirmed 11 days ago
B
Retailer 13
-
$477 AUD
$335 USD
View
B
Retailer 14
-
$541 AUD
$380 USD
View
B
Retailer 15
-
$541 AUD
$380 USD
View
Most Expensive
MOH London
LG770686841 · Oct 18
$1,069 AUD
£591 GBP
View
Price last confirmed 13 days ago
15 more retailers have this diamond
Prices start from $135 AUDSave up to $406 AUD

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
$135 AUD