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Princess|Lab Grown|IGI

1.71ct F SI1 Princess Lab Grown Diamond

ID • F/SI1 • IGI LG657423845

Shape and cutting style on the report: Princess cut

Certificate IGI LG657423845

Diamond specifications and retailer prices

From £143 GBP
$192 USD
As of November 2, 2026
Save £803 GBP (85%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £946 GBP at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.71ct lab-grown princess diamond

This 1.71ct lab-grown princess 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 LG657423845 or 657423845. Listed at 15 retailers as of November 2, 2026, with prices from £143 to £946, a £803 spread on the same certified stone. Brilliant Earth lists it at £946. 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
Crown angle44.5°
Pavilion angle35.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG657423845
Dimensions6.71 × 6.46 × 4.27 mm
L/W Ratio1.04
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.71 mm6.46 mm1.71 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG657423845
Side View
Table 76.0%Crown 44.5°Girdle: Slightly ThickPavilion 35.9°Culet: NoneDepth 66.1%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 2
Current: £946 GBP|Low: £143 GBP|High: £1,505 GBP|Avg: £515 GBP|-37.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 9£143 GBP
Retailer 2£228 GBP
Retailer 10£311 GBP
Retailer 4£321 GBP
Retailer 6£333 GBP
Retailer 3£376 GBP
Retailer 11£423 GBP
Retailer 8£574 GBP
Retailer 7£753 GBP
Retailer 5£832 GBP
Brilliant Earth£946 GBP

44 data points across 11 retailers

15 retailers£143 GBP to £946 GBP

A
Cheapest Retailer
-
£143 GBP
$192 USD
A
Retailer 2
-
£166 GBP
$223 USD
View
A
Retailer 3
-
£178 GBP
$239 USD
View
Retailer 4
-
£178 GBP
$239 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
£228 GBP
View
B+
Retailer 6
-
£311 GBP
$417 USD
View
A
Retailer 7
-
£321 GBP
View
A
Retailer 8
-
£333 GBP
€425 EUR
View
A
Retailer 9
-
£376 GBP
$504 USD
View
B+
Retailer 10
-
£423 GBP
$567 USD
View
B+
Retailer 11
-
£572 GBP
$767 USD
View
B
Retailer 12
-
£574 GBP
$770 USD
View
B
Retailer 13
-
£753 GBP
$1,010 USD
View
B
Retailer 14
-
£832 GBP
View
Most Expensive
B
Brilliant Earth
13299720A · Nov 2
£946 GBP
$1,270 USD
View
14 more retailers have this diamond
Prices start from £143 GBPSave up to £803 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 Princess
£143 GBP