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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

VG • D/IF • IGI LG815606188

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

Certificate IGI LG815606188

Diamond specifications and retailer prices

From £196 GBP
As of November 4, 2026
Save £561 GBP (74%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £884 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG815606188 or 815606188. Listed at 15 retailers as of November 3, 2026, with a 286% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
D
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.8°
Pavilion angle36.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG815606188
Dimensions7.38 × 5.23 × 3.64 mm
L/W Ratio1.41
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.38 mm5.23 mm1.21 ctD / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG815606188
Side View
Table 66.0%Crown 41.8°Girdle: STK-THKPavilion 36.1°Culet: NoneDepth 69.6%

Caratlytics Score

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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 4
Current: £884 GBP|Low: £196 GBP|High: £910 GBP|Avg: £536 GBP|-2.8%
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
November 4, 2026
Retailer 10£196 GBP
Retailer 8£204 GBP
Retailer 5£295 GBP
Retailer 14£377 GBP
Retailer 13£394 GBP
Retailer 2£407 GBP
Retailer 4£451 GBP
Retailer 12£533 GBP
Retailer 3£566 GBP
Retailer 9£703 GBP
Retailer 6£706 GBP
Retailer 11£739 GBP
Retailer 7£757 GBP
MOH London£884 GBP

24 data points across 14 retailers

15 retailers£196 GBP to £757 GBP

A
Cheapest Retailer
-
£196 GBP
Final sale: no returns
A
Retailer 2
-
£204 GBP
View
A
Retailer 3
-
£295 GBP
View
A
Retailer 4
-
£377 GBP
View
A
Retailer 5
-
£394 GBP
View
A
Retailer 6
-
£407 GBP
View
A
Retailer 7
-
£451 GBP
View
B+
Retailer 8
-
£533 GBP
View
B+
Retailer 9
-
£566 GBP
View
B+
Retailer 10
-
£703 GBP
View
B+
Retailer 11
-
£706 GBP
View
B+
Retailer 12
-
£739 GBP
View
B+
Retailer 13
-
£757 GBP
View
Retailer 14
-
£879 GBP
View
Price last confirmed 30 days ago
Most Expensive
MOH London
LG815606188 · Oct 26
£884 GBP
View
Price last confirmed 8 days ago
14 more retailers have this diamond
Prices start from £196 GBPSave up to £561 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
1.21ct Radiant
£196 GBP