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0.51ct E SI2 Round Lab Grown Diamond

EX • E/SI2 • IGI LG816670139

Shape and cutting style on the report: Round brilliant

Certificate IGI LG816670139

Diamond specifications and retailer prices

From £68 GBP
As of November 5, 2026
Save £551 GBP (89%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £619 GBP 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG816670139 or 816670139. Listed at 12 retailers as of November 4, 2026, with prices from £68 to £619, a £551 spread on the same certified stone. MOH London lists it at £619. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816670139
Dimensions5.11 × 5.14 × 3.14 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
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 mm5.14 mm0.51 ctE / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816670139
Side View
Table 60.0%Crown 34.1°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.2%

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 5
Current: £619 GBP|Low: £36 GBP|High: £628 GBP|Avg: £191 GBP|-0.3%
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
November 4, 2026
Retailer 4£36 GBP
Retailer 7£68 GBP
Retailer 11£76 GBP
Retailer 3£79 GBP
Retailer 8£90 GBP
Retailer 13£90 GBP
Retailer 2£119 GBP
Retailer 9£176 GBP
Retailer 5£241 GBP
Retailer 12£272 GBP
Retailer 6£303 GBP
Retailer 10£313 GBP
MOH London£619 GBP

17 data points across 13 retailers

12 retailers£68 GBP to £619 GBP

A
Cheapest Retailer
-
£68 GBP
A
Retailer 2
-
£76 GBP
View
Final sale: no returns
A
Retailer 3
-
£79 GBP
View
A
Retailer 4
-
£90 GBP
View
Retailer 5
-
£90 GBP
View
Price last confirmed 12 days ago
A
Retailer 6
-
£119 GBP
View
B+
Retailer 7
-
£176 GBP
View
B+
Retailer 8
-
£241 GBP
View
B+
Retailer 9
-
£272 GBP
View
B
Retailer 10
-
£303 GBP
View
B
Retailer 11
-
£313 GBP
View
Most Expensive
B
MOH London
LG816670139 · Nov 4
£619 GBP
View
11 more retailers have this diamond
Prices start from £68 GBPSave up to £551 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 Round
£68 GBP