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Radiant|Lab Grown|IGI

1.28ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG731537069

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG731537069

Diamond specifications and retailer prices

From £174 GBP
As of November 4, 2026
Save £1,322 GBP (88%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,815 GBP at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG731537069 or 731537069. Listed at 16 retailers as of November 4, 2026, with a 760% 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

1.28
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41°
Pavilion angle34.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731537069
Dimensions7.61 × 5.54 × 3.54 mm
L/W Ratio1.37
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
7.61 mm5.54 mm1.28 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731537069
Side View
Table 67.0%Crown 41°Girdle: Slightly ThickPavilion 34.7°Culet: NoneDepth 63.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £1,815 GBP|Low: £144 GBP|High: £1,874 GBP|Avg: £698 GBP|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 4, 2026
Retailer 16£155 GBP
Retailer 14£174 GBP
Retailer 7£180 GBP
Retailer 5£235 GBP
Retailer 3£262 GBP
Retailer 8£342 GBP
Retailer 2£403 GBP
Retailer 12£486 GBP
Retailer 15£517 GBP
Retailer 17£559 GBP
Retailer 6£659 GBP
Retailer 4£681 GBP
Retailer 13£819 GBP
Retailer 10£856 GBP
Retailer 9£1,448 GBP
Retailer 11£1,496 GBP
Brilliant Earth£1,815 GBP

37 data points across 17 retailers

16 retailers£174 GBP to £1,496 GBP

Retailer 1
-
£155 GBP
Price last confirmed 8 days ago
A
Retailer 2
-
£174 GBP
View
Final sale: no returns
Retailer 3
-
£180 GBP
View
Price last confirmed 7 days ago
A
Retailer 4
-
£235 GBP
View
B+
Retailer 5
-
£262 GBP
View
A
Retailer 6
-
£403 GBP
View
A
Retailer 7
-
£486 GBP
View
Retailer 8
-
£517 GBP
View
Price last confirmed 8 days ago
Retailer 9
-
£559 GBP
View
Price last confirmed 9 days ago
Retailer 10
-
£659 GBP
View
Price last confirmed 8 days ago
Retailer 11
-
£681 GBP
View
Price last confirmed 10 days ago
B+
Retailer 12
-
£819 GBP
View
B+
Retailer 13
-
£856 GBP
View
Retailer 14
-
£1,448 GBP
View
Price last confirmed 17 days ago
B
Retailer 15
-
£1,496 GBP
View
Most Expensive
Brilliant Earth
21405859Y · Oct 28
£1,815 GBP
$2,450 USD
View
Price last confirmed 7 days ago
15 more retailers have this diamond
Prices start from £174 GBPSave up to £1,322 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
1.28ct Radiant
£174 GBP