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Round|Lab Grown|IGI

1.35ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG660459305

Certificate IGI LG660459305

Diamond specifications and retailer prices

From £480 GBP
As of November 6, 2026
Save £185 GBP (28%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £665 GBP at Zales · As of November 6, 2026
View at Zales

About this 1.35ct lab-grown round diamond

This 1.35ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG660459305 or 660459305. Listed at 3 retailers as of November 6, 2026, with prices from £480 to £665, a £185 spread on the same certified stone. Zales lists it at £665. 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

1.35
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG660459305
Dimensions7.12 × 7.15 mm
L/W Ratio1.00
Top View
7.12 mm7.15 mm1.35 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG660459305
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.3%

Caratlytics Score

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

Last verified: Nov 6
Current: £480 GBP|Low: £480 GBP|High: £1,121 GBP|Avg: £832 GBP|-57.2%
Retailer 1
Retailer 2
Zales
November 6, 2026
Retailer 1£480 GBP
Retailer 2£665 GBP
Zales£665 GBP

8 data points across 3 retailers

3 retailers£480 GBP to £665 GBP

B+
Cheapest Retailer
-
£480 GBP
B
Retailer 2
-
£665 GBP
View
Most Expensive
B
Zales
523919542 · Nov 6
£665 GBP
$890 USD
View
2 more retailers have this diamond
Prices start from £480 GBPSave up to £185 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.

B+
1.35ct Round
£480 GBP