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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

EX • D/FL • IGI LG788625367

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

Certificate IGI LG788625367

Diamond specifications and retailer prices

From £251 GBP
As of November 2, 2026
Save £1,456 GBP (85%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,844 GBP at Rare Carat · As of October 18, 2026
View at Rare Carat

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 LG788625367 or 788625367. Listed at 9 retailers as of November 1, 2026, with a 580% 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
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.7°
Pavilion angle36.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788625367
Dimensions7.58 × 5.52 × 3.70 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
7.58 mm5.52 mm1.28 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788625367
Side View
Table 66.0%Crown 40.7°Girdle: MediumPavilion 36.9°Culet: NoneDepth 67.0%

Caratlytics Score

How it works →
A+
Exceptional
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £1,844 GBP|Low: £192 GBP|High: £2,452 GBP|Avg: £858 GBP|+5.4%
Rare Carat
Retailer 2
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Retailer 18
November 2, 2026
Retailer 4£192 GBP
Retailer 6£217 GBP
Retailer 2£251 GBP
Retailer 14£372 GBP
Retailer 3£499 GBP
Retailer 9£573 GBP
Retailer 18£593 GBP
Retailer 10£630 GBP
Retailer 5£662 GBP
Retailer 13£712 GBP
Retailer 17£715 GBP
Retailer 16£820 GBP
Retailer 15£978 GBP
Retailer 7£1,117 GBP
Retailer 8£1,227 GBP
Retailer 11£1,498 GBP
Retailer 12£1,706 GBP
Rare Carat£1,844 GBP

23 data points across 18 retailers

9 retailers£251 GBP to £1,706 GBP

A+
Cheapest Retailer
-
£251 GBP
A
Retailer 2
-
£372 GBP
$499 USD
View
B+
Retailer 3
-
£712 GBP
$956 USD
View
Retailer 4
-
£715 GBP
$960 USD
View
Price last confirmed 10 days ago
B+
Retailer 5
-
£820 GBP
$1,100 USD
View
B+
Retailer 6
-
£978 GBP
View
B
Retailer 7
-
£1,498 GBP
$2,010 USD
View
B
Retailer 8
-
£1,706 GBP
$2,290 USD
View
Most Expensive
Rare Carat
MR-186136 · Oct 18
£1,844 GBP
$2,475 USD
View
Price last confirmed 15 days ago
8 more retailers have this diamond
Prices start from £251 GBPSave up to £1,456 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
£251 GBP