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Radiant|Lab Grown|IGI

1.21ct F IF Radiant Lab Grown Diamond

ID • F/IF • IGI LG626470487

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

Certificate IGI LG626470487

Diamond specifications and retailer prices

From £156 GBP
As of November 4, 2026
Save £935 GBP (86%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: £1,091 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG626470487 or 626470487. Listed at 28 retailers as of November 6, 2026, with prices from £156 to £1,091, a £935 spread on the same certified stone. Brilliant Earth lists it at £1,091. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
F
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.4°
Pavilion angle34.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG626470487
Dimensions7.90 × 5.34 × 3.49 mm
L/W Ratio1.48
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
7.90 mm5.34 mm1.21 ctF / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG626470487
Side View
Table 64.0%Crown 44.4°Girdle: THN-MEDPavilion 34.4°Culet: NoneDepth 65.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £1,091 GBP|Low: £156 GBP|High: £1,554 GBP|Avg: £524 GBP|-29.8%
Brilliant Earth
Retailer 2
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Retailer 4
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Retailer 6
Retailer 7
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Retailer 11
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Retailer 16
November 7, 2026
Retailer 16£156 GBP
Retailer 5£178 GBP
Retailer 4£229 GBP
Retailer 3£275 GBP
Retailer 10£328 GBP
Retailer 9£329 GBP
Retailer 2£353 GBP
Retailer 6£376 GBP
Retailer 11£474 GBP
Retailer 7£593 GBP
Retailer 15£626 GBP
Retailer 8£687 GBP
Retailer 13£689 GBP
Retailer 12£778 GBP
Retailer 14£956 GBP
Brilliant Earth£1,091 GBP

44 data points across 16 retailers

28 retailers£156 GBP to £1,091 GBP

A
Cheapest Retailer
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£156 GBP
Retailer 2
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£156 GBP
View
Price last confirmed 30 days ago
Retailer 3
-
£156 GBP
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Price last confirmed 38 days ago
A
Retailer 4
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£156 GBP
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Retailer 5
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£182 GBP
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Price last confirmed 41 days ago
Retailer 6
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£191 GBP
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Price last confirmed 39 days ago
Retailer 7
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£194 GBP
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Price last confirmed 35 days ago
A
Retailer 8
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£229 GBP
View
A
Retailer 9
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£275 GBP
View
A
Retailer 10
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£328 GBP
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A
Retailer 11
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£329 GBP
View
A
Retailer 12
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£353 GBP
View
A
Retailer 13
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£376 GBP
View
A
Retailer 14
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£418 GBP
View
A
Retailer 15
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£474 GBP
View
B+
Retailer 16
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£593 GBP
View
B+
Retailer 17
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£624 GBP
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Retailer 18
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£624 GBP
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Price last confirmed 28 days ago
Retailer 19
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£624 GBP
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Price last confirmed 38 days ago
B+
Retailer 20
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£624 GBP
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B+
Retailer 21
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£626 GBP
View
B+
Retailer 22
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£660 GBP
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B+
Retailer 23
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£663 GBP
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Retailer 24
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£689 GBP
View
Price last confirmed 9 days ago
B+
Retailer 25
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£701 GBP
View
B+
Retailer 26
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£778 GBP
View
Retailer 27
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£956 GBP
View
Price last confirmed 17 days ago
Most Expensive
B
Brilliant Earth
9670732A · Nov 6
£1,091 GBP
$1,460 USD
View
27 more retailers have this diamond
Prices start from £156 GBPSave up to £935 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
£156 GBP