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Radiant|Lab Grown|IGI

1.71ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1

Diamond specifications and retailer prices

From £239 GBP
As of October 29, 2026
Save £537 GBP (69%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £776 GBP at Blue Nile · As of October 29, 2026
View at Blue Nile

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. Listed at 2 retailers as of October 29, 2026, with prices from £239 to £776, a £537 spread on the same certified stone. Blue Nile lists it at £776. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions8.50 × 5.87 × 3.95 mm
L/W Ratio1.45
Top View
8.50 mm5.87 mm1.71 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 64.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: £776 GBP|Low: £141 GBP|High: £776 GBP|Avg: £391 GBP
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 29, 2026
Retailer 4£141 GBP
Retailer 5£163 GBP
Retailer 2£239 GBP
Retailer 3£620 GBP
Blue Nile£776 GBP

18 data points across 5 retailers

2 retailers£239 GBP to £776 GBP

A
Cheapest Retailer
-
£239 GBP
Most Expensive
B
Blue Nile
20299611 · Oct 29
£776 GBP
$1,042 USD
View
1 more retailer has this diamond
Prices start from £239 GBPSave up to £537 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
£239 GBP