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Radiant|Lab Grown|IGI

1.71ct F SI1 Radiant Lab Grown Diamond

EX • F/SI1 • IGI LG662422012

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

Certificate IGI LG662422012

Diamond specifications and retailer prices

From £413 GBP
$553 USD
As of November 2, 2026
Save £163 GBP (28%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £576 GBP at Diamond Quarter · As of November 2, 2026
View at Diamond Quarter

About this 1.71ct lab-grown radiant diamond

This 1.71ct lab-grown radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG662422012 or 662422012. Listed at 2 retailers as of November 2, 2026, with prices from £413 to £576, a £163 spread on the same certified stone. Diamond Quarter lists it at £576. 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

1.71
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.2°
Pavilion angle36.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG662422012
Dimensions8.15 × 5.91 × 4.04 mm
L/W Ratio1.38
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.15 mm5.91 mm1.71 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG662422012
Side View
Table 69.0%Crown 43.2°Girdle: MediumPavilion 36.5°Culet: NoneDepth 68.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 2
Current: £413 GBP|Low: £404 GBP|High: £607 GBP|Avg: £472 GBP|-32.0%
September 23, 2026
Retailer 1£413 GBP

4 data points across 1 retailer

2 retailers£413 GBP to £576 GBP

A
Cheapest Retailer
-
£413 GBP
$553 USD
Most Expensive
B
Diamond Quarter
1.71SI1FLG128033N · Nov 2
£576 GBP
View
1 more retailer has this diamond
Prices start from £413 GBPSave up to £163 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
1.71ct Radiant
£413 GBP