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Radiant|Lab Grown|IGI

1.50ct D SI1 Radiant Lab Grown Diamond

GD • D/SI1 • IGI LG551208487

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

Certificate IGI LG551208487

Diamond specifications and retailer prices

From £648 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: £648 GBP at Diamond Quarter
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Diamond Quarter

About this 1.5ct lab-grown radiant diamond

This 1.5ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG551208487 or 551208487. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.50
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45°
Pavilion angle31.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG551208487
Dimensions7.53 × 5.59 × 3.82 mm
L/W Ratio1.35
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
7.53 mm5.59 mm1.50 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG551208487
Side View
Table 67.0%Crown 45°Girdle: MediumPavilion 31.2°Culet: NoneDepth 68.3%

Caratlytics Score

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C
Average
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Price History

Last verified: Oct 31
Current: £277 GBP|Low: £77 GBP|High: £865 GBP|Avg: £444 GBP
Retailer 1
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July 29, 2026
Retailer 10£77 GBP
Retailer 5£96 GBP
Retailer 8£181 GBP
Retailer 9£246 GBP
Retailer 11£269 GBP
Retailer 1£277 GBP
Retailer 4£353 GBP
Retailer 7£443 GBP
Retailer 6£455 GBP
Retailer 3£589 GBP
Retailer 2£796 GBP

68 data points across 11 retailers

1 retailer

C
Diamond Quarter
1.5SI1DLG87DD4FN · Oct 31
£648 GBP
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C
1.50ct Radiant
£648 GBP