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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG831632172

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

Certificate IGI LG831632172

Diamond specifications and retailer prices

From £199 GBP
As of November 4, 2026
Save £943 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,141 GBP at Michael Trio · As of November 4, 2026
View at Michael Trio

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 top-tier cut grade and certified by IGI LG831632172 or 831632172. Listed at 14 retailers as of November 4, 2026, with prices from £199 to £1,141, a £943 spread on the same certified stone. Michael Trio lists it at £1,141. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle53.9°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831632172
Dimensions8.08 × 5.14 × 3.29 mm
L/W Ratio1.57
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.08 mm5.14 mm1.21 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831632172
Side View
Table 63.0%Crown 53.9°Girdle: MED-STKPavilion 36°Culet: NoneDepth 64.0%

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: £1,141 GBP|Low: £199 GBP|High: £1,159 GBP|Avg: £570 GBP|-1.5%
Michael Trio
Retailer 2
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Retailer 7
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Retailer 14
November 4, 2026
Retailer 7£199 GBP
Retailer 2£225 GBP
Retailer 4£296 GBP
Retailer 3£352 GBP
Retailer 13£380 GBP
Retailer 8£411 GBP
Retailer 12£538 GBP
Retailer 6£567 GBP
Retailer 10£708 GBP
Retailer 11£744 GBP
Retailer 9£764 GBP
Retailer 5£863 GBP
Retailer 14£883 GBP
Michael Trio£1,141 GBP

22 data points across 14 retailers

14 retailers£199 GBP to £1,141 GBP

A
Cheapest Retailer
-
£199 GBP
Final sale: no returns
A
Retailer 2
-
£225 GBP
View
A
Retailer 3
-
£296 GBP
View
A
Retailer 4
-
£352 GBP
View
A
Retailer 5
-
£380 GBP
View
A
Retailer 6
-
£411 GBP
View
A
Retailer 7
-
£538 GBP
View
B+
Retailer 8
-
£567 GBP
View
B+
Retailer 9
-
£708 GBP
View
B+
Retailer 10
-
£744 GBP
View
B+
Retailer 11
-
£764 GBP
View
B+
Retailer 12
-
£863 GBP
View
B+
Retailer 13
-
£883 GBP
View
Most Expensive
B+
Michael Trio
1699734723 · Nov 4
£1,141 GBP
SGD 2,082 SGD
View
13 more retailers have this diamond
Prices start from £199 GBPSave up to £943 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
£199 GBP