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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG800678621

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

Certificate IGI LG800678621

Diamond specifications and retailer prices

From £401 GBP
HK$4,200 HKD
As of November 3, 2026
Save £2,073 GBP (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,474 GBP at Brilliant Earth · As of November 2, 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 FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG800678621 or 800678621. Listed at 13 retailers as of November 2, 2026, with prices from £401 to £2,474, a £2,073 spread on the same certified stone. Brilliant Earth lists it at £2,474. 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
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.2°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800678621
Dimensions8.14 × 5.39 × 3.46 mm
L/W Ratio1.51
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
8.14 mm5.39 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800678621
Side View
Table 63.0%Crown 40.2°Girdle: MediumPavilion 33.9°Culet: NoneDepth 64.2%

Caratlytics Score

How it works →
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 3
Current: £2,474 GBP|Low: £401 GBP|High: £2,474 GBP|Avg: £905 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 3, 2026
Retailer 4£401 GBP
Retailer 12£490 GBP
Retailer 8£522 GBP
Retailer 7£559 GBP
Retailer 6£598 GBP
Retailer 2£627 GBP
Retailer 10£664 GBP
Retailer 9£797 GBP
Retailer 11£1,144 GBP
Retailer 3£1,338 GBP
Retailer 5£1,355 GBP
Brilliant Earth£2,474 GBP

44 data points across 12 retailers

13 retailers£401 GBP to £2,474 GBP

A
Cheapest Retailer
-
£401 GBP
HK$4,200 HKD
A
Retailer 2
-
£490 GBP
$658 USD
View
A
Retailer 3
-
£522 GBP
$701 USD
View
A
Retailer 4
-
£559 GBP
€715 EUR
View
A
Retailer 5
-
£598 GBP
ZAR 12,965 ZAR
View
A
Retailer 6
-
£627 GBP
View
A
Retailer 7
-
£664 GBP
$891 USD
View
Retailer 8
-
£797 GBP
$1,070 USD
View
Price last confirmed 7 days ago
B+
Retailer 9
-
£1,144 GBP
$1,535 USD
View
B+
Retailer 10
-
£1,338 GBP
$1,795 USD
View
B+
Retailer 11
-
£1,355 GBP
View
Retailer 12
-
£1,751 GBP
$2,350 USD
View
Price last confirmed 75 days ago
Most Expensive
B
Brilliant Earth
20634873A · Nov 2
£2,474 GBP
$3,320 USD
View
12 more retailers have this diamond
Prices start from £401 GBPSave up to £2,073 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
£401 GBP