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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

EX • D/FL • IGI LG815698208

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

Certificate IGI LG815698208

Diamond specifications and retailer prices

From £178 GBP
$239 USD
As of November 2, 2026
Save £1,528 GBP (90%) vs most expensive(unlock to see where)
14 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 LG815698208 or 815698208. Listed at 14 retailers as of November 1, 2026, with a 858% 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 angle45°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG815698208
Dimensions7.54 × 5.35 × 3.60 mm
L/W Ratio1.41
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
7.54 mm5.35 mm1.28 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG815698208
Side View
Table 65.0%Crown 45°Girdle: STK-THKPavilion 34.3°Culet: NoneDepth 67.3%

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: £1,844 GBP|Low: £178 GBP|High: £2,452 GBP|Avg: £806 GBP|+5.4%
Rare Carat
Retailer 2
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November 2, 2026
Retailer 16£178 GBP
Retailer 9£202 GBP
Retailer 4£206 GBP
Retailer 14£228 GBP
Retailer 2£251 GBP
Retailer 20£372 GBP
Retailer 17£401 GBP
Retailer 10£573 GBP
Retailer 8£586 GBP
Retailer 7£622 GBP
Retailer 11£667 GBP
Retailer 19£712 GBP
Retailer 5£715 GBP
Retailer 21£783 GBP
Retailer 3£820 GBP
Retailer 15£982 GBP
Retailer 12£1,168 GBP
Retailer 6£1,392 GBP
Retailer 13£1,498 GBP
Retailer 18£1,706 GBP
Rare Carat£1,844 GBP

24 data points across 21 retailers

14 retailers£178 GBP to £1,706 GBP

A
Cheapest Retailer
-
£178 GBP
$239 USD
A
Retailer 2
-
£206 GBP
$277 USD
View
A
Retailer 3
-
£251 GBP
View
A
Retailer 4
-
£372 GBP
$499 USD
View
A
Retailer 5
-
£401 GBP
$538 USD
View
B+
Retailer 6
-
£712 GBP
$956 USD
View
Retailer 7
-
£715 GBP
$960 USD
View
Price last confirmed 11 days ago
B+
Retailer 8
-
£783 GBP
$1,051 USD
View
B+
Retailer 9
-
£820 GBP
$1,100 USD
View
B+
Retailer 10
-
£982 GBP
View
B
Retailer 11
-
£1,392 GBP
$1,868 USD
View
B
Retailer 12
-
£1,498 GBP
$2,010 USD
View
B
Retailer 13
-
£1,706 GBP
$2,290 USD
View
Most Expensive
Rare Carat
VR-220174 · Oct 18
£1,844 GBP
$2,475 USD
View
Price last confirmed 15 days ago
13 more retailers have this diamond
Prices start from £178 GBPSave up to £1,528 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