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Radiant|Natural|GIA

1.21ct I SI2 Radiant Natural Diamond

EX • I/SI2 • GIA 2558167281

Certificate GIA 2558167281

Diamond specifications and retailer prices

From £1,277 GBP
As of November 7, 2026
Save £1,964 GBP (61%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £3,241 GBP at NZ Jewellers · As of November 3, 2026
View at NZ Jewellers

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2558167281. Listed at 8 retailers as of November 3, 2026, with prices from £1,277 to £3,241, a £1,964 spread on the same certified stone. NZ Jewellers lists it at £3,241. 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle54.67°
Pavilion angle36.44°
OriginNatural
Grading LabGIA
CertificateGIA 2558167281
Dimensions6.91 × 5.37 × 3.66 mm
L/W Ratio1.29
Top View
6.91 mm5.37 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 2558167281
Side View
Table 71.0%Crown 54.67°Girdle: THK-VTKPavilion 36.44°Culet: NoneDepth 68.1%

Caratlytics Score

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

Price History

Last verified: Nov 7
Current: £3,241 GBP|Low: £1,230 GBP|High: £3,258 GBP|Avg: £1,743 GBP|-0.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 7, 2026
Retailer 3£1,277 GBP
Retailer 5£1,313 GBP
Retailer 6£1,329 GBP
Retailer 8£1,352 GBP
Retailer 2£1,390 GBP
Retailer 7£1,425 GBP
Retailer 4£2,328 GBP
NZ Jewellers£3,241 GBP

42 data points across 8 retailers

8 retailers£1,277 GBP to £3,241 GBP

A
Cheapest Retailer
-
£1,277 GBP
A
Retailer 2
-
£1,313 GBP
View
A
Retailer 3
-
£1,329 GBP
View
Retailer 4
-
£1,352 GBP
View
Price last confirmed 35 days ago
A
Retailer 5
-
£1,390 GBP
View
A
Retailer 6
-
£1,425 GBP
View
B+
Retailer 7
-
£2,328 GBP
View
Most Expensive
B
NZ Jewellers
3c79699f-d26b-4fe2-bbdd-c507cc815fd3 · Nov 3
£3,241 GBP
$4,338 USD
View
7 more retailers have this diamond
Prices start from £1,277 GBPSave up to £1,964 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 Radiant
£1,277 GBP