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Round|Lab Grown|GIA

1.18ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • GIA 1477656963

Certificate GIA 1477656963

Diamond specifications and retailer prices

From £336 GBP
As of November 4, 2026
Save £403 GBP (55%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £740 GBP at Brilliant Earth · As of November 5, 2026
View at Brilliant Earth

About this 1.18ct lab-grown round diamond

This 1.18ct lab-grown round sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1477656963. Listed at 2 retailers as of November 4, 2026, with prices from £336 to £740, a £403 spread on the same certified stone. Brilliant Earth lists it at £740. 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

1.18
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle41.4°
OriginLab Grown
Grading LabGIA
CertificateGIA 1477656963
Dimensions6.89 × 6.87 × 4.16 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Girdle conditionFaceted
Cert comments
This is a man-made diamond produced by CVD (Chemical Vapor Deposition) growth process and has evidence of post-growth treatments to change the color.
Key to symbols
Growth Remnant
Top View
6.89 mm6.87 mm1.18 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1477656963
Side View
Table 58.0%Crown 31.5°Girdle: MediumPavilion 41.4°Culet: NoneDepth 60.4%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 4
Current: £740 GBP|Low: £336 GBP|High: £777 GBP|Avg: £550 GBP|-4.8%
Brilliant Earth
Retailer 2
November 4, 2026
Retailer 2£336 GBP
Brilliant Earth£740 GBP

8 data points across 2 retailers

2 retailers£336 GBP to £740 GBP

B+
Cheapest Retailer
-
£336 GBP
Most Expensive
B
Brilliant Earth
8191056A · Nov 5
£740 GBP
$990 USD
View
1 more retailer has this diamond
Prices start from £336 GBPSave up to £403 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+
1.18ct Round
£336 GBP