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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 2554019948

Certificate GIA 2554019948

Diamond specifications and retailer prices

From £1,693 GBP
As of November 5, 2026
Save £2,345 GBP (58%) vs most expensive(unlock to see where)
30 retailers carry this diamond
Most expensive: £4,038 GBP at NZ Jewellers · As of October 20, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2554019948. Listed at 30 retailers as of November 5, 2026, with a 138% 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2554019948
Dimensions6.75 × 6.79 × 4.23 mm
L/W Ratio1.01
Star length50%
Top View
6.75 mm6.79 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2554019948
Side View
Table 57.0%Crown 36.5°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 5
Current: £2,187 GBP|Low: £1,693 GBP|High: £3,922 GBP|Avg: £2,444 GBP|-1.5%
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 6£1,693 GBP
Retailer 11£1,938 GBP
Retailer 9£2,100 GBP
Retailer 1£2,187 GBP
Retailer 3£2,303 GBP
Retailer 10£2,303 GBP
Retailer 4£2,369 GBP
Retailer 2£2,378 GBP
Retailer 7£2,675 GBP
Retailer 5£2,692 GBP
Retailer 8£3,866 GBP

33 data points across 11 retailers

30 retailers£1,693 GBP to £4,038 GBP

A
Cheapest Retailer
-
£1,693 GBP
A
Retailer 2
-
£1,881 GBP
View
A
Retailer 3
-
£1,938 GBP
View
Final sale: no returns
Retailer 4
-
£2,100 GBP
View
Price last confirmed 8 days ago
Retailer 5
-
£2,100 GBP
View
Price last confirmed 53 days ago
Retailer 6
-
£2,100 GBP
View
Price last confirmed 50 days ago
Retailer 7
-
£2,100 GBP
View
Price last confirmed 21 days ago
Retailer 8
-
£2,100 GBP
View
Price last confirmed 29 days ago
Retailer 9
-
£2,100 GBP
View
Price last confirmed 15 days ago
B+
Retailer 10
-
£2,123 GBP
View
Retailer 11
-
£2,181 GBP
View
Price last confirmed 38 days ago
B+
Retailer 12
-
£2,187 GBP
View
B+
Retailer 13
-
£2,303 GBP
View
B+
Retailer 14
-
£2,303 GBP
View
B+
Retailer 15
-
£2,369 GBP
View
B+
Retailer 16
-
£2,378 GBP
View
Retailer 17
-
£2,423 GBP
View
Price last confirmed 28 days ago
Retailer 18
-
£2,423 GBP
View
Price last confirmed 53 days ago
Retailer 19
-
£2,423 GBP
View
Price last confirmed 46 days ago
Retailer 20
-
£2,423 GBP
View
Price last confirmed 16 days ago
B+
Retailer 21
-
£2,423 GBP
View
B+
Retailer 22
-
£2,675 GBP
View
Retailer 23
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£2,690 GBP
View
Price last confirmed 22 days ago
B+
Retailer 24
-
£2,692 GBP
View
B
Retailer 25
-
£3,866 GBP
View
Retailer 26
-
£4,038 GBP
View
Price last confirmed 28 days ago
B
Retailer 27
-
£4,038 GBP
View
Retailer 28
-
£4,038 GBP
View
Price last confirmed 47 days ago
Retailer 29
-
£4,038 GBP
View
Price last confirmed 54 days ago
Most Expensive
NZ Jewellers
24d6ce57-5de8-432d-9b87-8fbf5ceb647d · Oct 20
£4,038 GBP
$5,435 USD
View
Price last confirmed 17 days ago
29 more retailers have this diamond
Prices start from £1,693 GBPSave up to £2,345 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
£1,693 GBP