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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 £772 GBP
$1,035 USD
As of November 1, 2026
Save £1,399 GBP (64%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £2,172 GBP at Rare Carat · As of November 1, 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 prices from £772 to £2,172, a £1,399 spread on the same certified stone. Rare Carat lists it at £2,172. 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
Colour
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: £2,172 GBP|Low: £533 GBP|High: £2,230 GBP|Avg: £1,033 GBP|-2.6%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 6£533 GBP
Retailer 7£616 GBP
Retailer 5£752 GBP
Retailer 4£772 GBP
Retailer 3£778 GBP
Retailer 2£2,086 GBP
Rare Carat£2,172 GBP

6 data points across 7 retailers

4 retailers£772 GBP to £2,172 GBP

B
Cheapest Retailer
-
£772 GBP
$1,035 USD
A
Retailer 2
-
£778 GBP
View
B
Retailer 3
-
£2,086 GBP
View
Most Expensive
C
Rare Carat
ABC3-19A_l_671401655 · Nov 1
£2,172 GBP
$2,910 USD
View
3 more retailers have this diamond
Prices start from £772 GBPSave up to £1,399 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
4.51ct Radiant
£772 GBP