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Round|Lab Grown|IGI

0.51ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG414059607

Shape and cutting style on the report: Round brilliant

Certificate IGI LG414059607

Diamond specifications and retailer prices

From £275 GBP
As of November 5, 2026
Save £726 GBP (73%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,330 GBP at MOH London · As of November 5, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG414059607 or 414059607. Listed at 12 retailers as of November 4, 2026, with a 264% 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
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.1°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG414059607
Dimensions5.09 × 5.11 × 3.15 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory grown diamond was created by high pressure high temperature process (HPHT) Type II
Top View
5.09 mm5.11 mm0.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG414059607
Side View
Table 56.5%Crown 35.1°Girdle: MED-STKPavilion 40.4°Culet: NoneDepth 61.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £1,330 GBP|Low: £265 GBP|High: £1,349 GBP|Avg: £584 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
November 6, 2026
Retailer 7£275 GBP
Retailer 8£275 GBP
Retailer 11£308 GBP
Retailer 4£319 GBP
Retailer 3£341 GBP
Retailer 9£341 GBP
Retailer 10£545 GBP
Retailer 2£609 GBP
Retailer 5£612 GBP
Retailer 6£1,001 GBP
Retailer 12£1,097 GBP
MOH London£1,330 GBP

44 data points across 12 retailers

12 retailers£275 GBP to £1,001 GBP

B+
Cheapest Retailer
-
£275 GBP
B+
Retailer 2
-
£275 GBP
View
B
Retailer 3
-
£308 GBP
View
Final sale: no returns
B
Retailer 4
-
£319 GBP
View
B
Retailer 5
-
£341 GBP
View
Retailer 6
-
£341 GBP
View
Price last confirmed 12 days ago
B
Retailer 7
-
£545 GBP
View
B
Retailer 8
-
£609 GBP
View
Retailer 9
-
£612 GBP
View
Price last confirmed 8 days ago
B
Retailer 10
-
£1,001 GBP
View
Retailer 11
-
£1,097 GBP
View
Price under review
Most Expensive
MOH London
LG414059607 · Nov 5
£1,330 GBP
View
Price under review
11 more retailers have this diamond
Prices start from £275 GBPSave up to £726 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.

B+
0.51ct Round
£275 GBP