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Marquise|Lab Grown|IGI

1.55ct D FL Marquise Lab Grown Diamond

EX • D/FL • IGI LG780685588

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG780685588

Diamond specifications and retailer prices

From £855 GBP
As of November 4, 2026
Save £2,845 GBP (77%) vs most expensive(unlock to see where)
25 retailers carry this diamond
Most expensive: £3,700 GBP at Brilliant Earth · As of November 3, 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 LG780685588 or 780685588. Listed at 25 retailers as of November 3, 2026, with prices from £855 to £3,700, a £2,845 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 angle35.6°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780685588
Dimensions11.67 × 6.08 × 3.87 mm
L/W Ratio1.92
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
11.67 mm6.08 mm1.55 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780685588
Side View
Table 60.0%Crown 35.6°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 63.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £3,700 GBP|Low: £733 GBP|High: £3,700 GBP|Avg: £1,798 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 5, 2026
Retailer 11£764 GBP
Retailer 4£886 GBP
Retailer 5£999 GBP
Retailer 9£1,014 GBP
Retailer 2£1,265 GBP
Retailer 12£1,267 GBP
Retailer 7£1,629 GBP
Retailer 8£1,709 GBP
Retailer 10£2,400 GBP
Retailer 3£2,615 GBP
Retailer 6£3,004 GBP
Brilliant Earth£3,700 GBP

35 data points across 12 retailers

25 retailers£855 GBP to £3,700 GBP

Retailer 1
-
£764 GBP
Price last confirmed 28 days ago
Retailer 2
-
£831 GBP
View
Price last confirmed 21 days ago
A
Retailer 3
-
£855 GBP
View
Final sale: no returns
Retailer 4
-
£886 GBP
View
Price last confirmed 33 days ago
Retailer 5
-
£886 GBP
View
Price last confirmed 24 days ago
A
Retailer 6
-
£970 GBP
View
A
Retailer 7
-
£999 GBP
View
A
Retailer 8
-
£1,014 GBP
View
A
Retailer 9
-
£1,036 GBP
View
A
Retailer 10
-
£1,265 GBP
View
A
Retailer 11
-
£1,267 GBP
View
B+
Retailer 12
-
£1,629 GBP
View
Retailer 13
-
£1,661 GBP
View
Price last confirmed 36 days ago
B+
Retailer 14
-
£1,709 GBP
View
B+
Retailer 15
-
£1,852 GBP
View
Retailer 16
-
£2,400 GBP
View
Price last confirmed 7 days ago
B
Retailer 17
-
£2,445 GBP
View
B
Retailer 18
-
£2,615 GBP
View
B
Retailer 19
-
£2,746 GBP
View
B
Retailer 20
-
£2,849 GBP
View
B
Retailer 21
-
£2,968 GBP
View
B
Retailer 22
-
£3,004 GBP
View
B
Retailer 23
-
£3,090 GBP
View
B
Retailer 24
-
£3,700 GBP
View
Most Expensive
B
Brilliant Earth
19705255A · Nov 3
£3,700 GBP
$4,980 USD
View
24 more retailers have this diamond
Prices start from £855 GBPSave up to £2,845 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
£855 GBP