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1.28ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 7506975051

Shape and cutting style on the report: Round brilliant

Certificate GIA 7506975051

Diamond specifications and retailer prices

From £7,325 GBP
As of November 2, 2026
1 retailer carries this diamond
Only listing: £7,325 GBP at Diamond Quarter
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Diamond Quarter

About this 1.28ct natural round diamond

This 1.28ct natural 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 GIA 7506975051. Listed at a single retailer as of November 2, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.28
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 7506975051
Dimensions6.88 × 6.91 × 4.35 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Culet sizeNone
Key to symbols
Cloud, Crystal, Needle
Top View
6.88 mm6.91 mm1.28 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7506975051
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 41°CuletDepth 63.1%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: £7,325 GBP|Low: £7,325 GBP|High: £7,325 GBP|Avg: £7,325 GBP
September 26, 2026
Diamond Quarter£7,325 GBP

1 data point across 1 retailer

1 retailer

B
Diamond Quarter
1.28SI1F7551690FN · Nov 2
£7,325 GBP
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B
1.28ct Round
£7,325 GBP