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Round|Natural|GIA

1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 1555486044

Certificate GIA 1555486044

Diamond specifications and retailer prices

From £1,867 GBP
$2,501 USD
As of October 31, 2026
Save £2,361 GBP (56%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £4,227 GBP at NZ Jewellers · As of October 30, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555486044. Listed at 6 retailers as of October 30, 2026, with prices from £1,867 to £4,227, a £2,361 spread on the same certified stone. NZ Jewellers lists it at £4,227. 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1555486044
Dimensions6.84 × 6.80 × 4.27 mm
L/W Ratio1.01
Star length50%
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
6.84 mm6.80 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555486044
Side View
Table 58.0%Crown 35.5°Girdle: STK-STKPavilion 41.2°Culet: NoneDepth 62.6%

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: Oct 31
Current: £4,227 GBP|Low: £1,471 GBP|High: £4,227 GBP|Avg: £2,648 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 31, 2026
Retailer 5£1,867 GBP
Retailer 3£1,925 GBP
Retailer 6£1,962 GBP
Retailer 2£2,395 GBP
Retailer 4£3,548 GBP
NZ Jewellers£4,227 GBP

38 data points across 6 retailers

6 retailers£1,867 GBP to £4,227 GBP

A
Cheapest Retailer
-
£1,867 GBP
$2,501 USD
Final sale: no returns
A
Retailer 2
-
£1,925 GBP
View
A
Retailer 3
-
£1,962 GBP
$2,629 USD
View
B+
Retailer 4
-
£2,395 GBP
€3,056 EUR
View
B
Retailer 5
-
£3,548 GBP
View
Most Expensive
B
NZ Jewellers
0cc4c077-b1ff-450f-a66d-88d521a93fee · Oct 30
£4,227 GBP
$5,664 USD
View
5 more retailers have this diamond
Prices start from £1,867 GBPSave up to £2,361 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
£1,867 GBP