Radiant|Lab Grown|IGI

4.51ct G SI1 Radiant Lab Grown Diamond

GD • G/SI1 • IGI LG671401655

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

Certificate IGI LG671401655

Diamond specifications and retailer prices

From €926 EUR
$1,035 USD
As of November 1, 2026
Save €1,576 EUR (63%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: €2,605 EUR at Rare Carat · As of October 19, 2026
View at Rare Carat

About this 4.51ct lab-grown radiant diamond

This 4.51ct lab-grown radiant sits in the three to five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG671401655 or 671401655. Listed at 4 retailers as of November 1, 2026, with a 170% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

4.51
Carat
G
Color
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.6°
Pavilion angle33.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG671401655
Dimensions11.44 × 8.10 × 5.46 mm
L/W Ratio1.41
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.44 mm8.10 mm4.51 ctG / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG671401655
Side View
Table 68.0%Crown 47.6°Girdle: THK-VTKPavilion 33.7°Culet: NoneDepth 67.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: €2,605 EUR|Low: €639 EUR|High: €2,675 EUR|Avg: €1,239 EUR|-2.6%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 6€639 EUR
Retailer 7€738 EUR
Retailer 5€901 EUR
Retailer 4€926 EUR
Retailer 3€933 EUR
Retailer 2€2,502 EUR
Rare Carat€2,605 EUR

6 data points across 7 retailers

4 retailers€926 EUR to €2,502 EUR

B
Cheapest Retailer
-
€926 EUR
$1,035 USD
A
Retailer 2
-
€933 EUR
£821 GBP
View
B
Retailer 3
-
€2,502 EUR
£2,201 GBP
View
Most Expensive
Rare Carat
ABC3-19A_l_671401655 · Oct 19
€2,605 EUR
$2,910 USD
View
Price last confirmed 13 days ago
3 more retailers have this diamond
Prices start from €926 EURSave up to €1,576 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.

A
4.51ct Radiant
€926 EUR