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Marquise|Lab Grown|IGI

1.55ct D FL Marquise Lab Grown Diamond

EX • D/FL • IGI LG790611664

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG790611664

Diamond specifications and retailer prices

From £685 GBP
As of November 4, 2026
Save £3,015 GBP (81%) vs most expensive(unlock to see where)
23 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 LG790611664 or 790611664. Listed at 23 retailers as of November 4, 2026, with prices from £685 to £3,700, a £3,015 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 angle34.5°
Pavilion angle39.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG790611664
Dimensions11.69 × 6.12 × 3.79 mm
L/W Ratio1.91
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
11.69 mm6.12 mm1.55 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG790611664
Side View
Table 58.0%Crown 34.5°Girdle: MediumPavilion 39.9°Culet: NoneDepth 61.9%

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: £3,700 GBP|Low: £685 GBP|High: £3,700 GBP|Avg: £1,621 GBP
Brilliant Earth
Retailer 2
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November 5, 2026
Retailer 15£685 GBP
Retailer 5£745 GBP
Retailer 11£767 GBP
Retailer 4£794 GBP
Retailer 20£794 GBP
Retailer 19£922 GBP
Retailer 17£925 GBP
Retailer 3£944 GBP
Retailer 9£952 GBP
Retailer 2£1,212 GBP
Retailer 18£1,262 GBP
Retailer 10£1,274 GBP
Retailer 13£1,461 GBP
Retailer 22£1,768 GBP
Retailer 8£2,196 GBP
Retailer 21£2,234 GBP
Retailer 6£2,486 GBP
Retailer 12£2,598 GBP
Retailer 14£2,666 GBP
Retailer 16£2,695 GBP
Retailer 7£2,762 GBP
Brilliant Earth£3,700 GBP

40 data points across 22 retailers

23 retailers£685 GBP to £3,700 GBP

A
Cheapest Retailer
-
£685 GBP
A
Retailer 2
-
£745 GBP
View
A
Retailer 3
-
£767 GBP
View
Final sale: no returns
A
Retailer 4
-
£794 GBP
View
Retailer 5
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£794 GBP
View
Price last confirmed 19 days ago
A
Retailer 6
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£922 GBP
View
A
Retailer 7
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£925 GBP
View
A
Retailer 8
-
£944 GBP
View
A
Retailer 9
-
£952 GBP
View
A
Retailer 10
-
£1,212 GBP
View
Retailer 11
-
£1,262 GBP
View
Price last confirmed 9 days ago
A
Retailer 12
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£1,274 GBP
View
B+
Retailer 13
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£1,461 GBP
View
B+
Retailer 14
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£1,768 GBP
View
B
Retailer 15
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£2,196 GBP
View
B
Retailer 16
-
£2,234 GBP
View
B+
Retailer 17
-
£2,359 GBP
View
B
Retailer 18
-
£2,486 GBP
View
B
Retailer 19
-
£2,598 GBP
View
B+
Retailer 20
-
£2,666 GBP
View
B
Retailer 21
-
£2,695 GBP
View
B
Retailer 22
-
£2,762 GBP
View
Most Expensive
B
Brilliant Earth
19074327A · Nov 4
£3,700 GBP
$4,980 USD
View
22 more retailers have this diamond
Prices start from £685 GBPSave up to £3,015 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
£685 GBP