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1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1533621018

Certificate GIA 1533621018

Diamond specifications and retailer prices

From £3,763 GBP
As of November 4, 2026
Save £4,124 GBP (52%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £7,887 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1533621018. Listed at 10 retailers as of November 4, 2026, with prices from £3,763 to £7,887, a £4,124 spread on the same certified stone. NZ Jewellers lists it at £7,887. 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

1.23
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1533621018
Dimensions6.83 × 6.77 × 4.26 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud, Crystal
Top View
6.83 mm6.77 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1533621018
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.7%

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 4
Current: £7,887 GBP|Low: £3,763 GBP|High: £7,887 GBP|Avg: £4,982 GBP
NZ Jewellers
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£3,763 GBP
Retailer 3£4,002 GBP
Retailer 9£4,272 GBP
Retailer 10£4,272 GBP
Retailer 2£4,465 GBP
Retailer 4£4,509 GBP
Retailer 8£4,522 GBP
Retailer 7£4,929 GBP
Retailer 5£5,112 GBP
Retailer 6£6,928 GBP
NZ Jewellers£7,887 GBP

27 data points across 11 retailers

10 retailers£3,763 GBP to £7,887 GBP

B+
Cheapest Retailer
-
£3,763 GBP
B+
Retailer 2
-
£4,272 GBP
View
B+
Retailer 3
-
£4,272 GBP
View
B+
Retailer 4
-
£4,465 GBP
View
B+
Retailer 5
-
£4,509 GBP
View
B
Retailer 6
-
£4,522 GBP
View
B
Retailer 7
-
£4,929 GBP
View
B
Retailer 8
-
£5,112 GBP
View
B
Retailer 9
-
£6,928 GBP
View
Most Expensive
B
NZ Jewellers
0c31a0e1-85f9-4a60-822a-9c707874e1ce · Nov 5
£7,887 GBP
$10,615 USD
View
9 more retailers have this diamond
Prices start from £3,763 GBPSave up to £4,124 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+
1.23ct Round
£3,763 GBP