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Radiant|Lab Grown|IGI

1.21ct H VS1 Radiant Lab Grown Diamond

ID • H/VS1 • IGI LG512237789

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

Certificate IGI LG512237789

Diamond specifications and retailer prices

From £166 GBP
As of November 5, 2026
Save £1,194 GBP (88%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,360 GBP at Do Amore Diamonds · As of November 5, 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 H colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG512237789 or 512237789. Listed at 19 retailers as of November 5, 2026, with prices from £166 to £1,360, a £1,194 spread on the same certified stone. Do Amore Diamonds lists it at £1,360. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
H
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.5°
Pavilion angle37°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512237789
Dimensions7.90 × 5.18 × 3.55 mm
L/W Ratio1.53
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
7.90 mm5.18 mm1.21 ctH / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512237789
Side View
Table 65.5%Crown 38.5°Girdle: MediumPavilion 37°Culet: NoneDepth 68.5%

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 5
Current: £1,360 GBP|Low: £136 GBP|High: £1,419 GBP|Avg: £522 GBP|+15.8%
Do Amore Diamonds
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 5, 2026
Retailer 8£166 GBP
Retailer 5£184 GBP
Retailer 15£237 GBP
Retailer 2£241 GBP
Retailer 14£262 GBP
Retailer 12£335 GBP
Retailer 11£435 GBP
Retailer 10£474 GBP
Retailer 6£551 GBP
Retailer 4£651 GBP
Retailer 13£752 GBP
Retailer 9£775 GBP
Retailer 7£804 GBP
Retailer 3£808 GBP
Do Amore Diamonds£1,360 GBP

35 data points across 15 retailers

19 retailers£166 GBP to £1,360 GBP

Retailer 1
-
£122 GBP
Price last confirmed 17 days ago
Retailer 2
-
£142 GBP
View
Price last confirmed 22 days ago
Retailer 3
-
£152 GBP
View
Price last confirmed 20 days ago
A
Retailer 4
-
£166 GBP
View
Final sale: no returns
Retailer 5
-
£184 GBP
View
Price last confirmed 17 days ago
B+
Retailer 6
-
£237 GBP
View
A
Retailer 7
-
£241 GBP
View
A
Retailer 8
-
£262 GBP
View
A
Retailer 9
-
£335 GBP
View
B+
Retailer 10
-
£435 GBP
View
B+
Retailer 11
-
£474 GBP
View
B+
Retailer 12
-
£500 GBP
View
B+
Retailer 13
-
£551 GBP
View
Retailer 14
-
£651 GBP
View
Price last confirmed 16 days ago
B
Retailer 15
-
£752 GBP
View
B
Retailer 16
-
£775 GBP
View
Retailer 17
-
£804 GBP
View
Price last confirmed 18 days ago
B
Retailer 18
-
£808 GBP
View
Most Expensive
B
Do Amore Diamonds
27-8142D3453 · Nov 5
£1,360 GBP
$1,830 USD
View
18 more retailers have this diamond
Prices start from £166 GBPSave up to £1,194 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
£166 GBP