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1.21ct F SI2 Round Natural Diamond

EX • F/SI2 • GIA 5503489142

Certificate GIA 5503489142

Diamond specifications and retailer prices

From £2,409 GBP
As of November 1, 2026
Save £3,394 GBP (58%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £5,802 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded F colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5503489142. Listed at 16 retailers as of November 1, 2026, with prices from £2,409 to £5,802, a £3,394 spread on the same certified stone. Diamond Quarter lists it at £5,802. 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

1.21
Carat
F
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5503489142
Dimensions6.81 × 6.78 × 4.22 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.81 mm6.78 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5503489142
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £3,044 GBP|Low: £2,087 GBP|High: £5,217 GBP|Avg: £3,399 GBP|+2.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 3, 2026
Retailer 6£2,443 GBP
Retailer 7£2,504 GBP
Retailer 5£2,513 GBP
Retailer 1£3,044 GBP
Retailer 2£3,168 GBP
Retailer 3£3,290 GBP
Retailer 9£3,389 GBP
Retailer 10£3,563 GBP
Retailer 4£5,008 GBP
Retailer 8£5,217 GBP

34 data points across 10 retailers

16 retailers£2,409 GBP to £5,802 GBP

A
Cheapest Retailer
-
£2,409 GBP
A
Retailer 2
-
£2,443 GBP
View
B+
Retailer 3
-
£2,513 GBP
View
Retailer 4
-
£2,713 GBP
View
Price last confirmed 21 days ago
Retailer 5
-
£2,713 GBP
View
Price last confirmed 17 days ago
Retailer 6
-
£2,817 GBP
View
Price last confirmed 22 days ago
B+
Retailer 7
-
£3,044 GBP
View
B+
Retailer 8
-
£3,071 GBP
View
B+
Retailer 9
-
£3,071 GBP
View
Retailer 10
-
£3,130 GBP
View
Price last confirmed 19 days ago
B+
Retailer 11
-
£3,168 GBP
View
B+
Retailer 12
-
£3,290 GBP
View
Retailer 13
-
£3,389 GBP
View
Price last confirmed 22 days ago
B
Retailer 14
-
£5,008 GBP
View
Retailer 15
-
£5,217 GBP
View
Price last confirmed 17 days ago
Most Expensive
B
Diamond Quarter
1.21SI2F55428241N · Nov 5
£5,802 GBP
View
15 more retailers have this diamond
Prices start from £2,409 GBPSave up to £3,394 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
1.21ct Round
£2,409 GBP