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1.23ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 1519310807

Certificate GIA 1519310807

Diamond specifications and retailer prices

From £2,345 GBP
As of November 6, 2026
Save £3,218 GBP (58%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £5,563 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 1519310807. Listed at 6 retailers as of November 5, 2026, with prices from £2,345 to £5,563, a £3,218 spread on the same certified stone. Diamond Quarter lists it at £5,563. 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
FluorescenceMedium
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1519310807
Dimensions6.79 × 6.84 × 4.30 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Key to symbols
Crystal, Cloud, Needle
Top View
6.79 mm6.84 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1519310807
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £4,237 GBP|Low: £1,853 GBP|High: £4,427 GBP|Avg: £3,228 GBP|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 4, 2026
Retailer 3£2,345 GBP
Retailer 4£2,420 GBP
Retailer 2£2,814 GBP
Retailer 1£4,237 GBP
Retailer 5£4,427 GBP

22 data points across 5 retailers

6 retailers£2,345 GBP to £5,563 GBP

A
Cheapest Retailer
-
£2,345 GBP
Final sale: no returns
A
Retailer 2
-
£2,420 GBP
View
B+
Retailer 3
-
£2,814 GBP
View
B
Retailer 4
-
£4,237 GBP
View
B
Retailer 5
-
£4,427 GBP
View
Most Expensive
B
Diamond Quarter
1.23SI1G1507B434N · Nov 5
£5,563 GBP
View
5 more retailers have this diamond
Prices start from £2,345 GBPSave up to £3,218 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.

A
1.23ct Round
£2,345 GBP