Radiant|Lab Grown|IGI

1.21ct D VS1 Radiant Lab Grown Diamond

ID • D/VS1 • IGI LG620456864

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

Certificate IGI LG620456864

Diamond specifications and retailer prices

From £172 GBP
$231 USD
As of October 30, 2026
Save £790 GBP (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,761 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

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 VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG620456864 or 620456864. Listed at 19 retailers as of October 30, 2026, with a 458% 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
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.1°
Pavilion angle35.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620456864
Dimensions7.56 × 5.22 × 3.50 mm
L/W Ratio1.45
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.56 mm5.22 mm1.21 ctD / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620456864
Side View
Table 66.0%Crown 46.1°Girdle: MediumPavilion 35.9°Culet: NoneDepth 67.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £445 GBP|Low: £165 GBP|High: £955 GBP|Avg: £421 GBP|+3.7%
Retailer 1
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 1, 2026
Retailer 14£172 GBP
Retailer 6£193 GBP
Retailer 4£199 GBP
Retailer 2£213 GBP
Retailer 15£213 GBP
Retailer 7£275 GBP
Retailer 13£286 GBP
Retailer 9£405 GBP
Retailer 1£445 GBP
Retailer 5£449 GBP
Retailer 10£571 GBP
Retailer 8£573 GBP
Retailer 12£688 GBP
Retailer 3£757 GBP
Retailer 11£949 GBP

43 data points across 15 retailers

19 retailers£172 GBP to £963 GBP

A
Cheapest Retailer
-
£172 GBP
$231 USD
A
Retailer 2
-
£193 GBP
$258 USD
View
Final sale: no returns
A
Retailer 3
-
£199 GBP
$267 USD
View
Retailer 4
-
£213 GBP
$286 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
£213 GBP
$286 USD
View
A
Retailer 6
-
£275 GBP
$368 USD
View
A
Retailer 7
-
£286 GBP
$383 USD
View
A
Retailer 8
-
£405 GBP
ZAR 8,757 ZAR
View
B+
Retailer 9
-
£445 GBP
View
B+
Retailer 10
-
£449 GBP
$601 USD
View
B+
Retailer 11
-
£571 GBP
A$1,177 AUD
View
B+
Retailer 12
-
£573 GBP
A$1,181 AUD
View
B
Retailer 13
-
£688 GBP
$922 USD
View
B
Retailer 14
-
£757 GBP
$1,014 USD
View
B
Retailer 15
-
£884 GBP
$1,185 USD
View
Retailer 16
-
£949 GBP
View
Price last confirmed 11 days ago
B
Retailer 17
-
£963 GBP
$1,290 USD
View
Retailer 18
-
£1,649 GBP
$2,210 USD
View
Price under review
Most Expensive
Do Amore Diamonds
23-620456864 · Oct 31
£1,761 GBP
$2,360 USD
View
Price under review
18 more retailers have this diamond
Prices start from £172 GBPSave up to £790 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
£172 GBP