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Radiant|Lab Grown|IGI

1.51ct D SI1 Radiant Lab Grown Diamond

VG • D/SI1 • IGI LG512213799

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

Certificate IGI LG512213799

Diamond specifications and retailer prices

From £583 GBP
As of November 5, 2026
3 retailers carry this diamond
Most expensive: £746 GBP at Rare Carat · As of August 20, 2026
View at Rare Carat

About this 1.51ct lab-grown radiant diamond

This 1.51ct 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 very-good cut grade and certified by IGI LG512213799 or 512213799. Listed at 3 retailers as of November 5, 2026. 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

1.51
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.4°
Pavilion angle37.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512213799
Dimensions7.97 × 5.65 × 3.91 mm
L/W Ratio1.41
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
7.97 mm5.65 mm1.51 ctD / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512213799
Side View
Table 66.0%Crown 47.4°Girdle: MED-STKPavilion 37.2°Culet: NoneDepth 69.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 5
Current: £746 GBP|Low: £193 GBP|High: £1,509 GBP|Avg: £603 GBP|-5.0%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
August 26, 2026
Retailer 3£210 GBP
Retailer 2£247 GBP
Retailer 7£275 GBP
Retailer 6£287 GBP
Retailer 4£649 GBP
Rare Carat£746 GBP
Retailer 8£1,203 GBP
Retailer 5£1,509 GBP

47 data points across 8 retailers

3 retailers

B
Cheapest Retailer
-
£583 GBP
Most Expensive
Rare Carat
F756978 · Aug 20
£746 GBP
$999 USD
View
Price last confirmed 78 days ago
1 more retailer has this diamond
Prices start from £583 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.

B
1.51ct Radiant
£583 GBP