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Marquise|Lab Grown|IGI

1.21ct F VS1 Marquise Lab Grown Diamond

EX • F/VS1 • IGI LG831685819

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG831685819

Diamond specifications and retailer prices

From £270 GBP
As of November 6, 2026
Save £499 GBP (65%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £769 GBP at Frank Darling · As of November 6, 2026
View at Frank Darling

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 LG831685819 or 831685819. Listed at 9 retailers as of November 6, 2026, with prices from £270 to £769, a £499 spread on the same certified stone. Frank Darling lists it at £769. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle41.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831685819
Dimensions10.77 × 5.56 × 3.54 mm
L/W Ratio1.94
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.77 mm5.56 mm1.21 ctF / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831685819
Side View
Table 61.0%Crown 35.2°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 63.7%

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 6
Current: £769 GBP|Low: £270 GBP|High: £769 GBP|Avg: £386 GBP
Frank Darling
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 8£270 GBP
Retailer 9£273 GBP
Retailer 12£288 GBP
Retailer 10£301 GBP
Retailer 11£322 GBP
Retailer 2£389 GBP
Retailer 3£412 GBP
Retailer 5£433 GBP
Retailer 6£521 GBP
Retailer 7£555 GBP
Retailer 4£592 GBP
Frank Darling£769 GBP

13 data points across 12 retailers

9 retailers£270 GBP to £769 GBP

A
Cheapest Retailer
-
£270 GBP
A
Retailer 2
-
£273 GBP
View
A
Retailer 3
-
£301 GBP
View
A
Retailer 4
-
£389 GBP
View
B+
Retailer 5
-
£433 GBP
View
Retailer 6
-
£501 GBP
View
Price last confirmed 38 days ago
B+
Retailer 7
-
£521 GBP
View
B+
Retailer 8
-
£555 GBP
View
Most Expensive
B
Frank Darling
100197152230BD · Nov 6
£769 GBP
$1,030 USD
View
8 more retailers have this diamond
Prices start from £270 GBPSave up to £499 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
£270 GBP