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Round|Natural|GIA

1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 6555394646

Certificate GIA 6555394646

Diamond specifications and retailer prices

From £1,606 GBP
As of November 5, 2026
Save £127 GBP (7%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £3,464 GBP at NZ Jewellers · As of October 23, 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 J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6555394646. Listed at 7 retailers as of November 5, 2026, with a relatively tight 8% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6555394646
Dimensions6.80 × 6.84 × 4.28 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Twinning Wisp, Crystal, Needle
Top View
6.80 mm6.84 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555394646
Side View
Table 56.0%Crown 35.5°GirdlePavilion 40.8°Culet: NoneDepth 62.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £3,464 GBP|Low: £1,594 GBP|High: £3,550 GBP|Avg: £2,203 GBP|-2.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3£1,603 GBP
Retailer 4£1,606 GBP
Retailer 5£1,624 GBP
Retailer 6£1,670 GBP
Retailer 2£1,733 GBP
Retailer 8£2,743 GBP
Retailer 7£2,940 GBP
NZ Jewellers£3,464 GBP

14 data points across 8 retailers

7 retailers£1,606 GBP to £1,733 GBP

Retailer 1
-
£1,603 GBP
Price last confirmed 9 days ago
A
Retailer 2
-
£1,606 GBP
View
Retailer 3
-
£1,624 GBP
View
Price last confirmed 8 days ago
Retailer 4
-
£1,670 GBP
View
Price last confirmed 17 days ago
B+
Retailer 5
-
£1,733 GBP
View
Retailer 6
-
£2,940 GBP
View
Price last confirmed 18 days ago
Most Expensive
NZ Jewellers
a1599ef9-aea0-4bf8-9ab8-51d6dd714bff · Oct 23
£3,464 GBP
$4,637 USD
View
Price last confirmed 14 days ago
6 more retailers have this diamond
Prices start from £1,606 GBPSave up to £127 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
£1,606 GBP