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Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 5506549779

Certificate GIA 5506549779

Diamond specifications and retailer prices

From £3,463 GBP
As of November 4, 2026
Save £3,179 GBP (48%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £6,642 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 5506549779. Listed at 16 retailers as of November 4, 2026, with prices from £3,463 to £6,642, a £3,179 spread on the same certified stone. NZ Jewellers lists it at £6,642. 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 angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5506549779
Dimensions6.86 × 6.80 × 4.31 mm
L/W Ratio1.01
Top View
6.86 mm6.80 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5506549779
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.0%

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: £4,222 GBP|Low: £3,463 GBP|High: £6,247 GBP|Avg: £4,251 GBP|+1.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 6£3,463 GBP
Retailer 7£3,666 GBP
Retailer 3£3,706 GBP
Retailer 4£3,812 GBP
Retailer 9£3,971 GBP
Retailer 8£4,003 GBP
Retailer 1£4,222 GBP
Retailer 2£4,845 GBP
Retailer 5£6,156 GBP

38 data points across 9 retailers

16 retailers£3,463 GBP to £6,642 GBP

B+
Cheapest Retailer
-
£3,463 GBP
B+
Retailer 2
-
£3,666 GBP
View
Final sale: no returns
B+
Retailer 3
-
£3,706 GBP
View
B+
Retailer 4
-
£3,722 GBP
View
B+
Retailer 5
-
£3,812 GBP
View
B+
Retailer 6
-
£3,971 GBP
View
Retailer 7
-
£3,971 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£3,971 GBP
View
Retailer 9
-
£4,003 GBP
View
Price last confirmed 28 days ago
B+
Retailer 10
-
£4,085 GBP
View
B+
Retailer 11
-
£4,222 GBP
View
B
Retailer 12
-
£4,583 GBP
View
B
Retailer 13
-
£4,845 GBP
View
B
Retailer 14
-
£6,156 GBP
View
B
Retailer 15
-
£6,565 GBP
View
Most Expensive
B
NZ Jewellers
1b6d518d-5cca-4551-b172-f30750849a94 · Nov 5
£6,642 GBP
$8,940 USD
View
15 more retailers have this diamond
Prices start from £3,463 GBPSave up to £3,179 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
£3,463 GBP