CaratHunter
Plans
Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6345619250

Certificate GIA 6345619250

Diamond specifications and retailer prices

From £4,183 GBP
As of November 1, 2026
Save £2,895 GBP (41%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £7,078 GBP at MOH London · As of November 4, 2026
View at MOH London

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 6345619250. Listed at 8 retailers as of November 1, 2026, with prices from £4,183 to £7,078, a £2,895 spread on the same certified stone. MOH London lists it at £7,078. 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
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6345619250
Dimensions6.86 × 6.81 × 4.26 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.86 mm6.81 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6345619250
Side View
Table 57.0%Crown 36°Girdle: ThickPavilion 41°Culet: NoneDepth 62.3%

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 1
Current: £7,078 GBP|Low: £4,099 GBP|High: £7,183 GBP|Avg: £5,067 GBP|+2.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 4£4,183 GBP
Retailer 8£4,201 GBP
Retailer 6£4,306 GBP
Retailer 9£4,609 GBP
Retailer 5£4,762 GBP
Retailer 7£4,817 GBP
Retailer 2£5,233 GBP
Retailer 10£5,637 GBP
Retailer 3£5,877 GBP
MOH London£7,078 GBP

37 data points across 10 retailers

8 retailers£4,183 GBP to £7,078 GBP

B+
Cheapest Retailer
-
£4,183 GBP
B+
Retailer 2
-
£4,201 GBP
View
B+
Retailer 3
-
£4,306 GBP
View
Retailer 4
-
£4,762 GBP
View
Price last confirmed 28 days ago
Retailer 5
-
£4,817 GBP
View
Price last confirmed 8 days ago
B
Retailer 6
-
£5,233 GBP
View
B
Retailer 7
-
£5,877 GBP
View
Most Expensive
B
MOH London
F721B937A · Nov 4
£7,078 GBP
View
7 more retailers have this diamond
Prices start from £4,183 GBPSave up to £2,895 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
£4,183 GBP