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Marquise|Lab Grown|IGI

1.21ct F VS1 Marquise Lab Grown Diamond

ID • F/VS1 • IGI LG831628716

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG831628716

Diamond specifications and retailer prices

From £141 GBP
As of November 6, 2026
Save £724 GBP (84%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,271 GBP at Queensmith · As of October 27, 2026
View at Queensmith

About this 1.21ct lab-grown marquise diamond

This 1.21ct lab-grown marquise sits in the classic one-carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG831628716 or 831628716. Listed at 19 retailers as of November 6, 2026, with a 513% 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
F
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831628716
Dimensions10.50 × 5.61 × 3.60 mm
L/W Ratio1.87
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.50 mm5.61 mm1.21 ctF / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831628716
Side View
Table 57.0%Crown 34.9°Girdle: STK-THKPavilion 40.4°Culet: NoneDepth 64.2%

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 6
Current: £315 GBP|Low: £136 GBP|High: £829 GBP|Avg: £352 GBP|+2.4%
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 7, 2026
Retailer 2£141 GBP
Retailer 7£158 GBP
Retailer 5£164 GBP
Retailer 3£175 GBP
Retailer 6£175 GBP
Retailer 13£235 GBP
Retailer 8£297 GBP
Retailer 14£298 GBP
Retailer 1£315 GBP
Retailer 9£427 GBP
Retailer 10£497 GBP
Retailer 12£507 GBP
Retailer 4£563 GBP
Retailer 15£565 GBP
Retailer 11£823 GBP

46 data points across 15 retailers

19 retailers£141 GBP to £865 GBP

A
Cheapest Retailer
-
£141 GBP
A
Retailer 2
-
£158 GBP
View
Final sale: no returns
A
Retailer 3
-
£164 GBP
View
Retailer 4
-
£175 GBP
View
Price last confirmed 13 days ago
A
Retailer 5
-
£175 GBP
View
B+
Retailer 6
-
£235 GBP
View
A
Retailer 7
-
£297 GBP
View
A
Retailer 8
-
£298 GBP
View
A
Retailer 9
-
£315 GBP
View
A
Retailer 10
-
£326 GBP
View
B+
Retailer 11
-
£427 GBP
View
B+
Retailer 12
-
£497 GBP
View
Retailer 13
-
£507 GBP
View
Price last confirmed 10 days ago
B+
Retailer 14
-
£563 GBP
View
B+
Retailer 15
-
£565 GBP
View
B+
Retailer 16
-
£603 GBP
View
Retailer 17
-
£823 GBP
View
Price last confirmed 9 days ago
B
Retailer 18
-
£865 GBP
View
Most Expensive
Queensmith
LG831628716 · Oct 27
£1,271 GBP
View
Price last confirmed 10 days ago
18 more retailers have this diamond
Prices start from £141 GBPSave up to £724 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 Marquise
£141 GBP