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Radiant|Natural|GIA

1.21ct E SI1 Radiant Natural Diamond

EX • E/SI1 • GIA 2518450103

Certificate GIA 2518450103

Diamond specifications and retailer prices

From £2,876 GBP
As of November 6, 2026
Save £3,040 GBP (51%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £5,916 GBP at NZ Jewellers · As of November 5, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2518450103. Listed at 14 retailers as of November 5, 2026, with prices from £2,876 to £5,916, a £3,040 spread on the same certified stone. NZ Jewellers lists it at £5,916. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.29°
Pavilion angle30.5°
OriginNatural
Grading LabGIA
CertificateGIA 2518450103
Dimensions6.67 × 5.23 × 3.64 mm
L/W Ratio1.28
Top View
6.67 mm5.23 mm1.21 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2518450103
Side View
Table 65.0%Crown 44.29°Girdle: THK-VTKPavilion 30.5°Culet: NoneDepth 69.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £5,916 GBP|Low: £2,876 GBP|High: £6,120 GBP|Avg: £3,948 GBP|-3.3%
NZ Jewellers
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
November 7, 2026
Retailer 5£2,876 GBP
Retailer 10£2,932 GBP
Retailer 4£3,044 GBP
Retailer 12£3,157 GBP
Retailer 2£3,375 GBP
Retailer 6£3,382 GBP
Retailer 3£3,496 GBP
Retailer 13£3,496 GBP
Retailer 7£3,607 GBP
Retailer 14£3,616 GBP
Retailer 8£3,648 GBP
Retailer 11£4,960 GBP
Retailer 9£5,393 GBP
NZ Jewellers£5,916 GBP

43 data points across 14 retailers

14 retailers£2,876 GBP to £5,916 GBP

B+
Cheapest Retailer
-
£2,876 GBP
B+
Retailer 2
-
£2,932 GBP
View
B+
Retailer 3
-
£3,044 GBP
View
B+
Retailer 4
-
£3,157 GBP
View
B+
Retailer 5
-
£3,375 GBP
View
B+
Retailer 6
-
£3,382 GBP
View
B+
Retailer 7
-
£3,496 GBP
View
B+
Retailer 8
-
£3,496 GBP
View
B
Retailer 9
-
£3,607 GBP
View
B
Retailer 10
-
£3,616 GBP
View
B+
Retailer 11
-
£3,648 GBP
View
B
Retailer 12
-
£4,960 GBP
View
B
Retailer 13
-
£5,393 GBP
View
Most Expensive
B
NZ Jewellers
c41f34da-ef32-4739-bab4-64ae197ec1fe · Nov 5
£5,916 GBP
$7,919 USD
View
13 more retailers have this diamond
Prices start from £2,876 GBPSave up to £3,040 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 Radiant
£2,876 GBP