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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 £71 GBP
$95 USD
As of October 24, 2026
Save £213 GBP (75%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £560 GBP 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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Price History

Last verified: Oct 24
Current: £560 GBP|Low: £59 GBP|High: £574 GBP|Avg: £183 GBP|-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£61 GBP
Retailer 13£68 GBP
Retailer 8£71 GBP
Retailer 4£81 GBP
Retailer 3£119 GBP
Retailer 2£127 GBP
Retailer 15£147 GBP
Retailer 12£157 GBP
Retailer 6£166 GBP
Retailer 14£194 GBP
Retailer 7£220 GBP
Retailer 11£244 GBP
Retailer 5£250 GBP
Retailer 10£284 GBP
MOH London£560 GBP

39 data points across 15 retailers

16 retailers£71 GBP to £284 GBP

Retailer 1
-
£61 GBP
$82 USD
Price last confirmed 7 days ago
A
Retailer 2
-
£71 GBP
$95 USD
View
Retailer 3
-
£81 GBP
$108 USD
View
Price last confirmed 10 days ago
A
Retailer 4
-
£96 GBP
HK$1,000 HKD
View
Retailer 5
-
£119 GBP
$160 USD
View
Price last confirmed 12 days ago
A
Retailer 6
-
£127 GBP
View
A
Retailer 7
-
£147 GBP
€187 EUR
View
B+
Retailer 8
-
£157 GBP
$210 USD
View
Retailer 9
-
£166 GBP
$222 USD
View
Price last confirmed 12 days ago
Retailer 10
-
£194 GBP
View
Price last confirmed 7 days ago
B+
Retailer 11
-
£220 GBP
SGD 399 SGD
View
Retailer 12
-
£244 GBP
$327 USD
View
Price last confirmed 10 days ago
B
Retailer 13
-
£250 GBP
$335 USD
View
B
Retailer 14
-
£284 GBP
$380 USD
View
B
Retailer 15
-
£284 GBP
$380 USD
View
Most Expensive
MOH London
LG770686841 · Oct 18
£560 GBP
View
Price last confirmed 12 days ago
15 more retailers have this diamond
Prices start from £71 GBPSave up to £213 GBP

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
£71 GBP