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Radiant|Lab Grown|IGI

1.68ct G SI1 Radiant Lab Grown Diamond

EX • G/SI1 • IGI LG639458574

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

Certificate IGI LG639458574

Diamond specifications and retailer prices

From £395 GBP
As of October 31, 2026
1 retailer carries this diamond
Only listing: £395 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 1.68ct lab-grown radiant diamond

This 1.68ct 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 LG639458574 or 639458574. 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. 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

1.68
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46.2°
Pavilion angle35.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG639458574
Dimensions8.46 × 5.92 × 3.90 mm
L/W Ratio1.43
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.46 mm5.92 mm1.68 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG639458574
Side View
Table 66.0%Crown 46.2°Girdle: MediumPavilion 35.1°CuletDepth 65.9%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 31
Current: £395 GBP|Low: £395 GBP|High: £395 GBP|Avg: £395 GBP
September 26, 2026
Diamond Quarter£395 GBP

1 data point across 1 retailer

1 retailer

B+
Diamond Quarter
1.68SI1GLG74A655N · Oct 31
£395 GBP
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B+
1.68ct Radiant
£395 GBP