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Marquise|Lab Grown|IGI

1.21ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG843637937

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG843637937

Diamond specifications and retailer prices

From £193 GBP
As of November 4, 2026
Save £1,407 GBP (88%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,600 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.21ct lab-grown marquise diamond

This 1.21ct lab-grown marquise sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG843637937 or 843637937. Listed at 19 retailers as of November 4, 2026, with prices from £193 to £1,600, a £1,407 spread on the same certified stone. Brilliant Earth lists it at £1,600. 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
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.9°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843637937
Dimensions11.35 × 5.33 × 3.33 mm
L/W Ratio2.13
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.35 mm5.33 mm1.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG843637937
Side View
Table 60.0%Crown 38.9°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 62.5%

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 4
Current: £840 GBP|Low: £193 GBP|High: £1,250 GBP|Avg: £599 GBP|-6.0%
Retailer 1
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Retailer 3
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Retailer 11
Retailer 12
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Retailer 18
November 5, 2026
Retailer 15£193 GBP
Retailer 5£216 GBP
Retailer 6£240 GBP
Retailer 13£245 GBP
Retailer 18£322 GBP
Retailer 12£356 GBP
Retailer 8£417 GBP
Retailer 2£453 GBP
Retailer 9£485 GBP
Retailer 4£573 GBP
Retailer 3£588 GBP
Retailer 17£733 GBP
Retailer 16£767 GBP
Retailer 14£805 GBP
Retailer 1£840 GBP
Retailer 11£955 GBP
Retailer 7£1,201 GBP
Retailer 10£1,250 GBP

9 data points across 18 retailers

19 retailers£193 GBP to £1,600 GBP

A
Cheapest Retailer
-
£193 GBP
A
Retailer 2
-
£216 GBP
View
Final sale: no returns
A
Retailer 3
-
£240 GBP
View
A
Retailer 4
-
£245 GBP
View
A
Retailer 5
-
£322 GBP
View
A
Retailer 6
-
£356 GBP
View
A
Retailer 7
-
£417 GBP
View
A
Retailer 8
-
£453 GBP
View
A
Retailer 9
-
£485 GBP
View
A
Retailer 10
-
£573 GBP
View
B+
Retailer 11
-
£588 GBP
View
B+
Retailer 12
-
£733 GBP
View
B+
Retailer 13
-
£767 GBP
View
B+
Retailer 14
-
£805 GBP
View
B+
Retailer 15
-
£840 GBP
View
B+
Retailer 16
-
£955 GBP
View
B
Retailer 17
-
£1,201 GBP
View
B
Retailer 18
-
£1,250 GBP
View
Most Expensive
B
Brilliant Earth
22406151A · Nov 4
£1,600 GBP
$2,160 USD
View
18 more retailers have this diamond
Prices start from £193 GBPSave up to £1,407 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
£193 GBP