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Marquise|Lab Grown|IGI

1.21ct E IF Marquise Lab Grown Diamond

ID • E/IF • IGI LG681583490

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG681583490

Diamond specifications and retailer prices

From £305 GBP
$408 USD
As of October 30, 2026
Save £1,203 GBP (80%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £1,508 GBP at Brilliant Earth · As of October 31, 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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG681583490 or 681583490. Listed at 22 retailers as of October 30, 2026, with prices from £305 to £1,508, a £1,203 spread on the same certified stone. Brilliant Earth lists it at £1,508. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG681583490
Dimensions10.98 × 5.56 × 3.46 mm
L/W Ratio1.97
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
10.98 mm5.56 mm1.21 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG681583490
Side View
Table 57.0%Crown 33.2°Girdle: STK-THKPavilion 40.1°Culet: NoneDepth 62.2%

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: Oct 30
Current: £1,508 GBP|Low: £305 GBP|High: £1,913 GBP|Avg: £837 GBP|-1.5%
Brilliant Earth
Retailer 2
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Retailer 19
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Retailer 22
November 1, 2026
Retailer 15£305 GBP
Retailer 10£340 GBP
Retailer 5£341 GBP
Retailer 4£378 GBP
Retailer 21£378 GBP
Retailer 6£411 GBP
Retailer 16£489 GBP
Retailer 9£549 GBP
Retailer 11£599 GBP
Retailer 17£602 GBP
Retailer 2£622 GBP
Retailer 3£628 GBP
Retailer 13£650 GBP
Retailer 22£1,061 GBP
Retailer 7£1,103 GBP
Retailer 14£1,202 GBP
Retailer 19£1,209 GBP
Retailer 20£1,215 GBP
Retailer 8£1,241 GBP
Retailer 12£1,387 GBP
Retailer 18£1,479 GBP
Brilliant Earth£1,508 GBP

39 data points across 22 retailers

22 retailers£305 GBP to £1,508 GBP

A
Cheapest Retailer
-
£305 GBP
$408 USD
A
Retailer 2
-
£340 GBP
$456 USD
View
Final sale: no returns
A
Retailer 3
-
£341 GBP
$457 USD
View
A
Retailer 4
-
£378 GBP
$506 USD
View
A
Retailer 5
-
£378 GBP
$506 USD
View
A
Retailer 6
-
£411 GBP
HK$4,300 HKD
View
A
Retailer 7
-
£489 GBP
$655 USD
View
A
Retailer 8
-
£549 GBP
$736 USD
View
B+
Retailer 9
-
£599 GBP
$802 USD
View
B+
Retailer 10
-
£602 GBP
€768 EUR
View
B+
Retailer 11
-
£622 GBP
View
B+
Retailer 12
-
£628 GBP
$841 USD
View
B+
Retailer 13
-
£650 GBP
ZAR 14,060 ZAR
View
B
Retailer 14
-
£1,061 GBP
$1,421 USD
View
B
Retailer 15
-
£1,103 GBP
View
B
Retailer 16
-
£1,202 GBP
SGD 2,177 SGD
View
B+
Retailer 17
-
£1,209 GBP
$1,620 USD
View
B
Retailer 18
-
£1,215 GBP
$1,628 USD
View
B
Retailer 19
-
£1,241 GBP
$1,663 USD
View
B
Retailer 20
-
£1,387 GBP
$1,859 USD
View
B
Retailer 21
-
£1,479 GBP
View
Most Expensive
B
Brilliant Earth
19056507A · Oct 31
£1,508 GBP
$2,020 USD
View
21 more retailers have this diamond
Prices start from £305 GBPSave up to £1,203 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
£305 GBP