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Round|Natural|GIA

1.21ct F SI2 Round Natural Diamond

EX • F/SI2 • GIA 5136012626

Certificate GIA 5136012626

Diamond specifications and retailer prices

From £5,641 GBP
As of November 4, 2026
Save £2,321 GBP (29%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £11,268 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 5136012626. Listed at 18 retailers as of November 4, 2026, with a 41% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
OriginNatural
Grading LabGIA
CertificateGIA 5136012626
Dimensions6.92 × 6.91 × 4.20 mm
L/W Ratio1.00
Top View
6.92 mm6.91 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5136012626
Side View
Table 57.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 60.7%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £7,867 GBP|Low: £5,129 GBP|High: £12,309 GBP|Avg: £7,509 GBP|+5.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 5, 2026
Retailer 11£5,641 GBP
Retailer 3£5,780 GBP
Retailer 17£5,963 GBP
Retailer 9£6,155 GBP
Retailer 2£6,214 GBP
Retailer 13£6,369 GBP
Retailer 8£6,867 GBP
Retailer 6£6,900 GBP
Retailer 4£7,006 GBP
Retailer 5£7,531 GBP
Retailer 7£7,531 GBP
Retailer 16£7,580 GBP
Retailer 12£7,777 GBP
Retailer 1£7,867 GBP
Retailer 15£7,961 GBP
Retailer 10£9,919 GBP
Retailer 14£10,615 GBP

37 data points across 17 retailers

18 retailers£5,641 GBP to £7,961 GBP

B
Cheapest Retailer
-
£5,641 GBP
B
Retailer 2
-
£5,780 GBP
View
B
Retailer 3
-
£5,963 GBP
View
B
Retailer 4
-
£6,155 GBP
View
Final sale: no returns
B
Retailer 5
-
£6,214 GBP
View
Retailer 6
-
£6,369 GBP
View
Price last confirmed 8 days ago
Retailer 7
-
£6,867 GBP
View
Price last confirmed 15 days ago
B
Retailer 8
-
£6,900 GBP
View
B
Retailer 9
-
£7,006 GBP
View
B
Retailer 10
-
£7,531 GBP
View
B
Retailer 11
-
£7,531 GBP
View
B
Retailer 12
-
£7,580 GBP
View
B
Retailer 13
-
£7,777 GBP
View
B
Retailer 14
-
£7,867 GBP
View
B
Retailer 15
-
£7,961 GBP
View
Retailer 16
-
£9,919 GBP
View
Price under review
Retailer 17
-
£10,615 GBP
View
Price under review
Most Expensive
Diamond Quarter
1.21SI2F5126EA3DN · Nov 5
£11,268 GBP
View
Price under review
17 more retailers have this diamond
Prices start from £5,641 GBPSave up to £2,321 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
1.21ct Round
£5,641 GBP