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Marquise|Lab Grown|IGI

1.55ct D FL Marquise Lab Grown Diamond

EX • D/FL • IGI LG790611819

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG790611819

Diamond specifications and retailer prices

From £695 GBP
As of November 4, 2026
Save £3,005 GBP (81%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: £3,700 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.55ct lab-grown marquise diamond

This 1.55ct lab-grown marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG790611819 or 790611819. Listed at 24 retailers as of November 4, 2026, with prices from £695 to £3,700, a £3,005 spread on the same certified stone. Brilliant Earth lists it at £3,700. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.55
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG790611819
Dimensions11.81 × 6.10 × 3.82 mm
L/W Ratio1.94
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
11.81 mm6.10 mm1.55 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG790611819
Side View
Table 58.0%Crown 35.4°Girdle: MED-STKPavilion 40°Culet: NoneDepth 62.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £3,700 GBP|Low: £695 GBP|High: £3,700 GBP|Avg: £1,668 GBP
Brilliant Earth
Retailer 2
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November 5, 2026
Retailer 15£695 GBP
Retailer 5£756 GBP
Retailer 11£778 GBP
Retailer 4£806 GBP
Retailer 19£806 GBP
Retailer 3£932 GBP
Retailer 17£936 GBP
Retailer 22£946 GBP
Retailer 9£962 GBP
Retailer 2£1,230 GBP
Retailer 18£1,281 GBP
Retailer 10£1,291 GBP
Retailer 16£1,482 GBP
Retailer 21£1,793 GBP
Retailer 8£2,230 GBP
Retailer 20£2,266 GBP
Retailer 6£2,522 GBP
Retailer 12£2,629 GBP
Retailer 14£2,704 GBP
Retailer 13£2,733 GBP
Retailer 7£2,803 GBP
Brilliant Earth£3,700 GBP

38 data points across 22 retailers

24 retailers£695 GBP to £3,700 GBP

A
Cheapest Retailer
-
£695 GBP
A
Retailer 2
-
£756 GBP
View
A
Retailer 3
-
£778 GBP
View
Final sale: no returns
Retailer 4
-
£806 GBP
View
Price last confirmed 19 days ago
A
Retailer 5
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£806 GBP
View
A
Retailer 6
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£932 GBP
View
A
Retailer 7
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£936 GBP
View
A
Retailer 8
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£946 GBP
View
A
Retailer 9
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£962 GBP
View
A
Retailer 10
-
£1,230 GBP
View
Retailer 11
-
£1,281 GBP
View
Price last confirmed 9 days ago
A
Retailer 12
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£1,291 GBP
View
B+
Retailer 13
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£1,482 GBP
View
B+
Retailer 14
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£1,793 GBP
View
B
Retailer 15
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£2,230 GBP
View
B
Retailer 16
-
£2,266 GBP
View
B+
Retailer 17
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£2,394 GBP
View
B
Retailer 18
-
£2,522 GBP
View
B
Retailer 19
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£2,629 GBP
View
B
Retailer 20
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£2,704 GBP
View
B
Retailer 21
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£2,733 GBP
View
Retailer 22
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£2,794 GBP
View
Price last confirmed 88 days ago
B
Retailer 23
-
£2,803 GBP
View
Most Expensive
B
Brilliant Earth
19074259A · Nov 4
£3,700 GBP
$4,980 USD
View
23 more retailers have this diamond
Prices start from £695 GBPSave up to £3,005 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
1.55ct Marquise
£695 GBP