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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 HK$745 HKD
$95 USD
As of October 24, 2026
Save HK$2,236 HKD (75%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: HK$5,889 HKD 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

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: Oct 24
Current: HK$5,889 HKD|Low: HK$620 HKD|High: HK$6,038 HKD|Avg: HK$1,925 HKD|-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 9HK$643 HKD
Retailer 13HK$714 HKD
Retailer 8HK$745 HKD
Retailer 4HK$847 HKD
Retailer 3HK$1,255 HKD
Retailer 2HK$1,335 HKD
Retailer 15HK$1,541 HKD
Retailer 12HK$1,648 HKD
Retailer 6HK$1,742 HKD
Retailer 14HK$2,038 HKD
Retailer 7HK$2,317 HKD
Retailer 11HK$2,566 HKD
Retailer 5HK$2,628 HKD
Retailer 10HK$2,981 HKD
MOH LondonHK$5,889 HKD

38 data points across 15 retailers

16 retailersHK$745 HKD to HK$2,981 HKD

Retailer 1
-
HK$643 HKD
$82 USD
Price last confirmed 8 days ago
A
Retailer 2
-
HK$745 HKD
$95 USD
View
Retailer 3
-
HK$847 HKD
$108 USD
View
Price last confirmed 11 days ago
A
Retailer 4
-
HK$1,004 HKD
View
Retailer 5
-
HK$1,255 HKD
$160 USD
View
Price last confirmed 13 days ago
A
Retailer 6
-
HK$1,335 HKD
£134 GBP
View
A
Retailer 7
-
HK$1,541 HKD
€187 EUR
View
B+
Retailer 8
-
HK$1,648 HKD
$210 USD
View
Retailer 9
-
HK$1,742 HKD
$222 USD
View
Price last confirmed 13 days ago
Retailer 10
-
HK$2,038 HKD
£205 GBP
View
Price last confirmed 8 days ago
Retailer 11
-
HK$2,317 HKD
SGD 399 SGD
View
Price last confirmed 7 days ago
Retailer 12
-
HK$2,566 HKD
$327 USD
View
Price last confirmed 11 days ago
B
Retailer 13
-
HK$2,628 HKD
$335 USD
View
B
Retailer 14
-
HK$2,981 HKD
$380 USD
View
B
Retailer 15
-
HK$2,981 HKD
$380 USD
View
Most Expensive
MOH London
LG770686841 · Oct 18
HK$5,889 HKD
£591 GBP
View
Price last confirmed 13 days ago
15 more retailers have this diamond
Prices start from HK$745 HKDSave up to HK$2,236 HKD

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
HK$745 HKD