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Marquise|Lab Grown|IGI

1.20ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG731580885

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG731580885

Diamond specifications and retailer prices

From £279 GBP
As of November 4, 2026
Save £1,039 GBP (79%) vs most expensive(unlock to see where)
29 retailers carry this diamond
Most expensive: £1,347 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

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 LG731580885 or 731580885. Listed at 29 retailers as of November 4, 2026, with a 372% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.6°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731580885
Dimensions10.81 × 5.53 × 3.51 mm
L/W Ratio1.95
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
10.81 mm5.53 mm1.20 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731580885
Side View
Table 61.0%Crown 37.6°Girdle: MED-STKPavilion 39.8°Culet: NoneDepth 63.5%

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: £993 GBP|Low: £200 GBP|High: £1,574 GBP|Avg: £857 GBP
NZ Jewellers
Retailer 2
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Retailer 23
November 5, 2026
Retailer 15£200 GBP
Retailer 20£279 GBP
Retailer 18£360 GBP
Retailer 14£404 GBP
Retailer 17£404 GBP
Retailer 22£437 GBP
Retailer 2£545 GBP
Retailer 11£571 GBP
Retailer 12£610 GBP
Retailer 9£647 GBP
Retailer 7£696 GBP
Retailer 5£704 GBP
Retailer 19£759 GBP
Retailer 21£907 GBP
NZ Jewellers£993 GBP
Retailer 6£1,025 GBP
Retailer 3£1,038 GBP
Retailer 10£1,130 GBP
Retailer 4£1,181 GBP
Retailer 23£1,207 GBP
Retailer 13£1,235 GBP
Retailer 16£1,250 GBP
Retailer 8£1,319 GBP

29 data points across 23 retailers

29 retailers£279 GBP to £1,319 GBP

Retailer 1
-
£200 GBP
Price last confirmed 28 days ago
A
Retailer 2
-
£279 GBP
View
Final sale: no returns
Retailer 3
-
£338 GBP
View
Price last confirmed 36 days ago
A
Retailer 4
-
£360 GBP
View
Retailer 5
-
£379 GBP
View
Price last confirmed 37 days ago
A
Retailer 6
-
£404 GBP
View
Retailer 7
-
£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
-
£545 GBP
View
B+
Retailer 12
-
£571 GBP
View
B+
Retailer 13
-
£610 GBP
View
B+
Retailer 14
-
£647 GBP
View
B
Retailer 15
-
£696 GBP
View
B+
Retailer 16
-
£704 GBP
View
B+
Retailer 17
-
£759 GBP
View
B+
Retailer 18
-
£907 GBP
View
B+
Retailer 19
-
£993 GBP
View
B
Retailer 20
-
£1,025 GBP
View
B
Retailer 21
-
£1,038 GBP
View
Retailer 22
-
£1,130 GBP
View
Price last confirmed 8 days ago
B
Retailer 23
-
£1,181 GBP
View
B
Retailer 24
-
£1,207 GBP
View
B
Retailer 25
-
£1,235 GBP
View
Retailer 26
-
£1,250 GBP
View
Price last confirmed 28 days ago
Retailer 27
-
£1,297 GBP
View
Price last confirmed 26 days ago
B
Retailer 28
-
£1,319 GBP
View
Most Expensive
NZ Jewellers
e4b2b041-3e56-4070-9a49-52da5d7f8576 · Sep 30
£1,347 GBP
$1,819 USD
View
Price last confirmed 35 days ago
28 more retailers have this diamond
Prices start from £279 GBPSave up to £1,039 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