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Marquise|Lab Grown|IGI

1.20ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG764689885

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG764689885

Diamond specifications and retailer prices

From £325 GBP
As of November 4, 2026
Save £1,534 GBP (83%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £1,859 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 LG764689885 or 764689885. Listed at 23 retailers as of November 4, 2026, with prices from £325 to £1,859, a £1,534 spread on the same certified stone. Brilliant Earth lists it at £1,859. 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 angle34.3°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG764689885
Dimensions10.74 × 5.53 × 3.48 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
10.74 mm5.53 mm1.20 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG764689885
Side View
Table 58.0%Crown 34.3°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 62.9%

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: £1,859 GBP|Low: £325 GBP|High: £2,170 GBP|Avg: £885 GBP|-14.3%
Brilliant Earth
Retailer 2
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November 5, 2026
Retailer 16£325 GBP
Retailer 10£364 GBP
Retailer 7£364 GBP
Retailer 5£403 GBP
Retailer 23£403 GBP
Retailer 6£445 GBP
Retailer 19£511 GBP
Retailer 9£570 GBP
Retailer 4£610 GBP
Retailer 11£633 GBP
Retailer 20£639 GBP
Retailer 2£660 GBP
Retailer 17£695 GBP
Retailer 18£982 GBP
Retailer 3£1,084 GBP
Retailer 21£1,137 GBP
Retailer 8£1,173 GBP
Retailer 14£1,279 GBP
Retailer 22£1,296 GBP
Retailer 15£1,321 GBP
Retailer 12£1,449 GBP
Retailer 13£1,476 GBP
Brilliant Earth£1,859 GBP

38 data points across 23 retailers

23 retailers£325 GBP to £1,859 GBP

A
Cheapest Retailer
-
£325 GBP
A
Retailer 2
-
£364 GBP
View
Final sale: no returns
A
Retailer 3
-
£364 GBP
View
Retailer 4
-
£403 GBP
View
Price last confirmed 11 days ago
A
Retailer 5
-
£403 GBP
View
A
Retailer 6
-
£445 GBP
View
A
Retailer 7
-
£511 GBP
View
B+
Retailer 8
-
£570 GBP
View
B+
Retailer 9
-
£610 GBP
View
B+
Retailer 10
-
£633 GBP
View
Retailer 11
-
£639 GBP
View
Price last confirmed 9 days ago
B+
Retailer 12
-
£660 GBP
View
B+
Retailer 13
-
£695 GBP
View
B+
Retailer 14
-
£982 GBP
View
B
Retailer 15
-
£1,084 GBP
View
Retailer 16
-
£1,137 GBP
View
Price last confirmed 8 days ago
B
Retailer 17
-
£1,173 GBP
View
B
Retailer 18
-
£1,279 GBP
View
B
Retailer 19
-
£1,296 GBP
View
B
Retailer 20
-
£1,321 GBP
View
B
Retailer 21
-
£1,449 GBP
View
B
Retailer 22
-
£1,476 GBP
View
Most Expensive
B
Brilliant Earth
19056600A · Nov 4
£1,859 GBP
$2,510 USD
View
22 more retailers have this diamond
Prices start from £325 GBPSave up to £1,534 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
£325 GBP