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Round|Natural|GIA

1.21ct F SI2 Round Natural Diamond

EX • F/SI2 • GIA 2557099524

Certificate GIA 2557099524

Diamond specifications and retailer prices

From £1,674 GBP
As of November 6, 2026
Save £2,012 GBP (55%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £4,655 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

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 2557099524. Listed at 17 retailers as of November 2, 2026, with a 120% 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
FluorescenceMedium
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2557099524
Dimensions6.79 × 6.84 × 4.16 mm
L/W Ratio1.01
Top View
6.79 mm6.84 mm1.21 ctF / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2557099524
Side View
Table 61.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.0%

Caratlytics Score

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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 6
Current: £1,743 GBP|Low: £1,664 GBP|High: £3,768 GBP|Avg: £2,303 GBP|-2.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11£1,674 GBP
Retailer 1£1,743 GBP
Retailer 7£1,955 GBP
Retailer 10£2,031 GBP
Retailer 2£2,034 GBP
Retailer 3£2,227 GBP
Retailer 9£2,289 GBP
Retailer 5£2,319 GBP
Retailer 4£2,332 GBP
Retailer 6£2,560 GBP
Retailer 8£3,685 GBP

38 data points across 11 retailers

17 retailers£1,674 GBP to £3,685 GBP

A
Cheapest Retailer
-
£1,674 GBP
A
Retailer 2
-
£1,743 GBP
View
A
Retailer 3
-
£1,955 GBP
View
A
Retailer 4
-
£2,031 GBP
View
A
Retailer 5
-
£2,034 GBP
View
Final sale: no returns
A
Retailer 6
-
£2,075 GBP
View
Retailer 7
-
£2,227 GBP
View
Price last confirmed 43 days ago
Retailer 8
-
£2,227 GBP
View
Price last confirmed 17 days ago
Retailer 9
-
£2,227 GBP
View
Price last confirmed 21 days ago
A
Retailer 10
-
£2,289 GBP
View
A
Retailer 11
-
£2,319 GBP
View
B+
Retailer 12
-
£2,332 GBP
View
B+
Retailer 13
-
£2,560 GBP
View
Retailer 14
-
£2,569 GBP
View
Price last confirmed 45 days ago
B
Retailer 15
-
£3,685 GBP
View
Retailer 16
-
£4,655 GBP
View
Price last confirmed 42 days ago
Most Expensive
NZ Jewellers
7f9bf449-dab7-4491-b009-3dc9b40f010e · Oct 17
£4,655 GBP
$6,231 USD
View
Price last confirmed 20 days ago
16 more retailers have this diamond
Prices start from £1,674 GBPSave up to £2,012 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
£1,674 GBP