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0.51ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG840619657

Shape and cutting style on the report: Round brilliant

Certificate IGI LG840619657

Diamond specifications and retailer prices

From £151 GBP
As of November 2, 2026
Save £455 GBP (75%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £607 GBP at MOH London · As of November 1, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG840619657 or 840619657. Listed at 7 retailers as of November 1, 2026, with prices from £151 to £607, a £455 spread on the same certified stone. MOH London lists it at £607. 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
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840619657
Dimensions5.14 × 5.15 × 3.13 mm
L/W Ratio1.00
Girdle conditionFaceted
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
5.14 mm5.15 mm0.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840619657
Side View
Table 58.0%Crown 33.4°Girdle: MediumPavilion 40.9°Culet: NoneDepth 60.8%

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 2
Current: £607 GBP|Low: £142 GBP|High: £613 GBP|Avg: £266 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 2£151 GBP
Retailer 4£153 GBP
Retailer 3£158 GBP
Retailer 6£174 GBP
Retailer 7£310 GBP
Retailer 5£312 GBP
MOH London£607 GBP

20 data points across 7 retailers

7 retailers£151 GBP to £607 GBP

A
Cheapest Retailer
-
£151 GBP
A
Retailer 2
-
£153 GBP
$205 USD
View
A
Retailer 3
-
£158 GBP
€202 EUR
View
A
Retailer 4
-
£174 GBP
$233 USD
View
B+
Retailer 5
-
£310 GBP
$415 USD
View
B+
Retailer 6
-
£312 GBP
$418 USD
View
Most Expensive
B
MOH London
LG840619657 · Nov 1
£607 GBP
View
6 more retailers have this diamond
Prices start from £151 GBPSave up to £455 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
£151 GBP