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Radiant|Natural|GIA

1.21ct I SI2 Radiant Natural Diamond

EX • I/SI2 • GIA 2557742575

Certificate GIA 2557742575

Diamond specifications and retailer prices

From £1,396 GBP
As of November 6, 2026
Save £1,950 GBP (58%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £4,003 GBP at NZ Jewellers · As of October 11, 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 2557742575. Listed at 12 retailers as of November 4, 2026, with a 140% 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 (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557742575
Dimensions7.22 × 5.34 × 3.51 mm
L/W Ratio1.35
Girdle conditionPolished
Top View
7.22 mm5.34 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557742575
Side View
Table 67.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 65.7%

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 6
Current: £4,003 GBP|Low: £1,387 GBP|High: £4,064 GBP|Avg: £2,211 GBP|-1.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 7, 2026
Retailer 9£1,396 GBP
Retailer 12£1,695 GBP
Retailer 11£1,767 GBP
Retailer 2£1,774 GBP
Retailer 5£1,883 GBP
Retailer 3£1,892 GBP
Retailer 6£1,944 GBP
Retailer 4£2,114 GBP
Retailer 7£2,259 GBP
Retailer 10£2,784 GBP
Retailer 8£3,346 GBP
NZ Jewellers£4,003 GBP

15 data points across 12 retailers

12 retailers£1,396 GBP to £3,346 GBP

A
Cheapest Retailer
-
£1,396 GBP
A
Retailer 2
-
£1,695 GBP
View
B+
Retailer 3
-
£1,767 GBP
View
Final sale: no returns
A
Retailer 4
-
£1,774 GBP
View
B+
Retailer 5
-
£1,883 GBP
View
B+
Retailer 6
-
£1,892 GBP
View
B+
Retailer 7
-
£1,944 GBP
View
B+
Retailer 8
-
£2,114 GBP
View
B+
Retailer 9
-
£2,259 GBP
View
B
Retailer 10
-
£2,784 GBP
View
B
Retailer 11
-
£3,346 GBP
View
Most Expensive
NZ Jewellers
538ffc4d-5d2d-4a9b-8e3d-4341c6573678 · Oct 11
£4,003 GBP
$5,358 USD
View
Price last confirmed 26 days ago
11 more retailers have this diamond
Prices start from £1,396 GBPSave up to £1,950 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
£1,396 GBP