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Radiant|Lab Grown|IGI

1.51ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG512205221

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

Certificate IGI LG512205221

Diamond specifications and retailer prices

From €1,129 EUR
As of November 6, 2026
Save €1,729 EUR (61%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: €3,028 EUR at NZ Jewellers · As of November 6, 2026
View at NZ Jewellers

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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG512205221 or 512205221. Listed at 12 retailers as of November 4, 2026, with a 153% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.3°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512205221
Dimensions7.74 × 5.83 × 3.83 mm
L/W Ratio1.33
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.74 mm5.83 mm1.51 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512205221
Side View
Table 65.5%Crown 39.3°Girdle: STK-THKPavilion 33.9°Culet: NoneDepth 65.7%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 6
Current: €2,265 EUR|Low: €1,129 EUR|High: €4,675 EUR|Avg: €2,196 EUR|-2.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 7, 2026
Retailer 5€1,129 EUR
Retailer 4€1,393 EUR
Retailer 8€1,558 EUR
Retailer 6€1,616 EUR
Retailer 9€1,769 EUR
Retailer 1€2,265 EUR
Retailer 7€2,543 EUR
Retailer 3€2,857 EUR
Retailer 2€4,601 EUR

45 data points across 9 retailers

12 retailers€1,129 EUR to €2,857 EUR

B
Cheapest Retailer
-
€1,129 EUR
B
Retailer 2
-
€1,393 EUR
View
B
Retailer 3
-
€1,515 EUR
View
B
Retailer 4
-
€1,558 EUR
View
Final sale: no returns
Retailer 5
-
€1,616 EUR
View
Price last confirmed 26 days ago
B
Retailer 6
-
€1,616 EUR
View
B
Retailer 7
-
€1,769 EUR
View
B
Retailer 8
-
€2,265 EUR
View
B
Retailer 9
-
€2,543 EUR
View
B
Retailer 10
-
€2,857 EUR
View
Most Expensive
NZ Jewellers
b618a428-6616-4a89-9992-a285cf965b9e · Nov 6
€3,028 EUR
$3,381 USD
View
Price under review
10 more retailers have this diamond
Prices start from €1,129 EURSave up to €1,729 EUR

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
€1,129 EUR