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Radiant|Lab Grown|IGI

1.00ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG781638068

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG781638068

Diamond specifications and retailer prices

From £181 GBP
As of November 6, 2026
Save £445 GBP (71%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £626 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1ct lab-grown radiant diamond

This 1ct lab-grown radiant sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG781638068 or 781638068. Listed at 10 retailers as of November 4, 2026, with prices from £181 to £626, a £445 spread on the same certified stone. MOH London lists it at £626. 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

1.00
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.3°
Pavilion angle35.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG781638068
Dimensions7.12 × 4.94 × 3.27 mm
L/W Ratio1.44
Culet sizePointed
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
7.12 mm4.94 mm1.00 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG781638068
Side View
Table 66.0%Crown 42.3°Girdle: MediumPavilion 35.1°Culet: NoneDepth 66.2%

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 6
Current: £626 GBP|Low: £181 GBP|High: £635 GBP|Avg: £336 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9£181 GBP
Retailer 8£214 GBP
Retailer 3£229 GBP
Retailer 2£234 GBP
Retailer 5£255 GBP
Retailer 4£299 GBP
Retailer 7£317 GBP
Retailer 10£473 GBP
Retailer 6£523 GBP
MOH London£626 GBP

42 data points across 10 retailers

10 retailers£181 GBP to £626 GBP

B+
Cheapest Retailer
-
£181 GBP
A
Retailer 2
-
£214 GBP
View
A
Retailer 3
-
£229 GBP
View
A
Retailer 4
-
£234 GBP
View
A
Retailer 5
-
£255 GBP
View
B+
Retailer 6
-
£299 GBP
View
B+
Retailer 7
-
£317 GBP
View
B
Retailer 8
-
£473 GBP
View
Retailer 9
-
£523 GBP
View
Price last confirmed 16 days ago
Most Expensive
B
MOH London
LG781638068 · Nov 4
£626 GBP
View
9 more retailers have this diamond
Prices start from £181 GBPSave up to £445 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
1.00ct Radiant
£181 GBP