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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG816602405

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

Certificate IGI LG816602405

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 LG816602405 or 816602405. Listed at 9 retailers as of November 2, 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.8°
Pavilion angle39.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816602405
Dimensions7.74 × 5.26 × 3.72 mm
L/W Ratio1.47
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
7.74 mm5.26 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816602405
Side View
Table 62.0%Crown 38.8°Girdle: MediumPavilion 39.4°Culet: NoneDepth 70.7%

Caratlytics Score

How it works →
A+
Exceptional
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: £1,844 GBP|Low: £202 GBP|High: £2,452 GBP|Avg: £848 GBP|+5.4%
Rare Carat
Retailer 2
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November 2, 2026
Retailer 5£202 GBP
Retailer 10£228 GBP
Retailer 2£251 GBP
Retailer 15£372 GBP
Retailer 3£509 GBP
Retailer 7£573 GBP
Retailer 4£586 GBP
Retailer 18£622 GBP
Retailer 8£667 GBP
Retailer 14£712 GBP
Retailer 17£715 GBP
Retailer 16£820 GBP
Retailer 6£965 GBP
Retailer 11£977 GBP
Retailer 9£1,168 GBP
Retailer 12£1,498 GBP
Retailer 13£1,706 GBP
Rare Carat£1,844 GBP

22 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 11 days ago
B+
Retailer 5
-
£820 GBP
$1,100 USD
View
B+
Retailer 6
-
£977 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
PD-217234 · 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