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1.23ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 5506576801

Certificate GIA 5506576801

Diamond specifications and retailer prices

From £2,786 GBP
As of November 6, 2026
Save £3,129 GBP (53%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £5,915 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5506576801. Listed at 7 retailers as of November 5, 2026, with prices from £2,786 to £5,915, a £3,129 spread on the same certified stone. Diamond Quarter lists it at £5,915. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5506576801
Dimensions6.79 × 6.85 × 4.28 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.79 mm6.85 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5506576801
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.8%

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: £3,570 GBP|Low: £2,432 GBP|High: £5,801 GBP|Avg: £4,122 GBP|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 3£3,073 GBP
Retailer 4£3,115 GBP
Retailer 1£3,570 GBP
Retailer 2£5,288 GBP
Retailer 5£5,801 GBP

20 data points across 5 retailers

7 retailers£2,786 GBP to £5,915 GBP

B+
Cheapest Retailer
-
£2,786 GBP
B+
Retailer 2
-
£3,073 GBP
View
Final sale: no returns
B+
Retailer 3
-
£3,115 GBP
View
B+
Retailer 4
-
£3,570 GBP
View
B
Retailer 5
-
£5,288 GBP
View
B
Retailer 6
-
£5,801 GBP
View
Most Expensive
B
Diamond Quarter
1.23SI1G5501E3A1N · Nov 5
£5,915 GBP
View
6 more retailers have this diamond
Prices start from £2,786 GBPSave up to £3,129 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
£2,786 GBP