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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

EX • D/FL

Diamond specifications and retailer prices

From £178 GBP
$239 USD
As of November 2, 2026
Save £1,214 GBP (87%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,392 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

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. Listed at 5 retailers as of October 31, 2026, with prices from £178 to £1,392, a £1,214 spread on the same certified stone. Blue Nile lists it at £1,392. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.58 × 5.52 × 3.70 mm
L/W Ratio1.37
Top View
7.58 mm5.52 mm1.28 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 66.0%CrownGirdle: MediumPavilionCulet: NoneDepth 67.0%

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 2
Current: £1,392 GBP|Low: £178 GBP|High: £2,005 GBP|Avg: £890 GBP
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 27, 2026
Retailer 2£178 GBP
Retailer 5£206 GBP
Retailer 3£401 GBP
Retailer 4£783 GBP
Blue Nile£1,392 GBP
Retailer 6£2,005 GBP

12 data points across 6 retailers

5 retailers£178 GBP to £1,392 GBP

A
Cheapest Retailer
-
£178 GBP
$239 USD
A
Retailer 2
-
£206 GBP
$277 USD
View
A
Retailer 3
-
£401 GBP
$538 USD
View
B+
Retailer 4
-
£783 GBP
$1,051 USD
View
Most Expensive
B
Blue Nile
30353737 · Oct 31
£1,392 GBP
$1,868 USD
View
4 more retailers have this diamond
Prices start from £178 GBPSave up to £1,214 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
£178 GBP