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Marquise|Lab Grown|IGI

1.20ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG754594815

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG754594815

Diamond specifications and retailer prices

From £279 GBP
As of November 4, 2026
Save £1,217 GBP (81%) vs most expensive(unlock to see where)
30 retailers carry this diamond
Most expensive: £1,496 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.2ct lab-grown marquise diamond

This 1.2ct 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 LG754594815 or 754594815. Listed at 30 retailers as of November 4, 2026, with prices from £279 to £1,496, a £1,217 spread on the same certified stone. Brilliant Earth lists it at £1,496. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.20
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754594815
Dimensions11.03 × 5.46 × 3.45 mm
L/W Ratio2.02
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
11.03 mm5.46 mm1.20 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754594815
Side View
Table 58.0%Crown 36°Girdle: STK-THKPavilion 40°Culet: NoneDepth 63.2%

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 4
Current: £1,496 GBP|Low: £279 GBP|High: £1,919 GBP|Avg: £912 GBP|-22.0%
Brilliant Earth
Retailer 2
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November 5, 2026
Retailer 20£279 GBP
Retailer 16£338 GBP
Retailer 18£360 GBP
Retailer 15£404 GBP
Retailer 17£404 GBP
Retailer 23£437 GBP
Retailer 2£545 GBP
Retailer 12£571 GBP
Retailer 14£610 GBP
Retailer 10£647 GBP
Retailer 8£696 GBP
Retailer 6£704 GBP
Retailer 19£759 GBP
Retailer 22£907 GBP
Retailer 21£993 GBP
Retailer 7£1,025 GBP
Retailer 4£1,038 GBP
Retailer 11£1,130 GBP
Retailer 5£1,181 GBP
Retailer 3£1,207 GBP
Retailer 13£1,235 GBP
Retailer 9£1,324 GBP
Brilliant Earth£1,496 GBP

31 data points across 23 retailers

30 retailers£279 GBP to £1,496 GBP

A
Cheapest Retailer
-
£279 GBP
Final sale: no returns
Retailer 2
-
£338 GBP
View
Price last confirmed 28 days ago
Retailer 3
-
£338 GBP
View
Price last confirmed 36 days ago
A
Retailer 4
-
£360 GBP
View
Retailer 5
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£379 GBP
View
Price last confirmed 37 days ago
A
Retailer 6
-
£404 GBP
View
Retailer 7
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£404 GBP
View
Price last confirmed 28 days ago
Retailer 8
-
£404 GBP
View
Price last confirmed 26 days ago
Retailer 9
-
£414 GBP
View
Price last confirmed 37 days ago
A
Retailer 10
-
£437 GBP
View
A
Retailer 11
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£545 GBP
View
B+
Retailer 12
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£571 GBP
View
B+
Retailer 13
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£610 GBP
View
B+
Retailer 14
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£647 GBP
View
Retailer 15
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£661 GBP
View
Price last confirmed 21 days ago
B+
Retailer 16
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£696 GBP
View
B+
Retailer 17
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£704 GBP
View
B+
Retailer 18
-
£759 GBP
View
B+
Retailer 19
-
£907 GBP
View
B+
Retailer 20
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£993 GBP
View
B+
Retailer 21
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£1,025 GBP
View
B+
Retailer 22
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£1,038 GBP
View
Retailer 23
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£1,130 GBP
View
Price last confirmed 8 days ago
B
Retailer 24
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£1,181 GBP
View
B
Retailer 25
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£1,207 GBP
View
B
Retailer 26
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£1,235 GBP
View
Retailer 27
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£1,297 GBP
View
Price last confirmed 26 days ago
B
Retailer 28
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£1,324 GBP
View
Retailer 29
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£1,347 GBP
View
Price last confirmed 36 days ago
Most Expensive
B
Brilliant Earth
17981286A · Nov 4
£1,496 GBP
$2,020 USD
View
29 more retailers have this diamond
Prices start from £279 GBPSave up to £1,217 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
1.20ct Marquise
£279 GBP