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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG735580809

Shape and cutting style on the report: Cut cornered rectangular mixed cut

Certificate IGI LG735580809

Diamond specifications and retailer prices

From £217 GBP
As of November 4, 2026
Save £886 GBP (80%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,422 GBP at Rare Carat · As of September 28, 2026
View at Rare Carat

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 LG735580809 or 735580809. Listed at 20 retailers as of November 4, 2026, with a 408% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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 angle25.5°
Pavilion angle33.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG735580809
Dimensions7.65 × 4.90 × 3.18 mm
L/W Ratio1.56
Culet sizeLong
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.65 mm4.90 mm1.21 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG735580809
Side View
Table 60.0%Crown 25.5°Girdle: MED-STKPavilion 33.4°Culet: LNGDepth 64.9%

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 4
Current: £1,422 GBP|Low: £208 GBP|High: £1,422 GBP|Avg: £555 GBP
Rare Carat
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
Retailer 15
November 4, 2026
Retailer 15£217 GBP
Retailer 7£243 GBP
Retailer 5£252 GBP
Retailer 3£269 GBP
Retailer 6£269 GBP
Retailer 14£374 GBP
Retailer 13£385 GBP
Retailer 11£433 GBP
Retailer 9£464 GBP
Retailer 2£471 GBP
Retailer 8£721 GBP
Retailer 4£864 GBP
Retailer 12£900 GBP
Retailer 10£1,078 GBP
Rare Carat£1,422 GBP

44 data points across 15 retailers

20 retailers£217 GBP to £1,103 GBP

A
Cheapest Retailer
-
£217 GBP
A
Retailer 2
-
£243 GBP
View
Final sale: no returns
A
Retailer 3
-
£252 GBP
View
Retailer 4
-
£269 GBP
View
Price last confirmed 10 days ago
A
Retailer 5
-
£269 GBP
View
A
Retailer 6
-
£374 GBP
View
A
Retailer 7
-
£385 GBP
View
A
Retailer 8
-
£433 GBP
View
A
Retailer 9
-
£464 GBP
View
A
Retailer 10
-
£464 GBP
View
A
Retailer 11
-
£471 GBP
View
B+
Retailer 12
-
£721 GBP
View
B
Retailer 13
-
£864 GBP
View
B+
Retailer 14
-
£900 GBP
View
B
Retailer 15
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£900 GBP
View
B
Retailer 16
-
£992 GBP
View
B
Retailer 17
-
£1,050 GBP
View
B
Retailer 18
-
£1,078 GBP
View
B
Retailer 19
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£1,103 GBP
View
Most Expensive
Rare Carat
91965A_l_735580809 · Sep 28
£1,422 GBP
$1,920 USD
View
Price last confirmed 37 days ago
19 more retailers have this diamond
Prices start from £217 GBPSave up to £886 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
£217 GBP