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Round|Natural|GIA

1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 5553650322

Certificate GIA 5553650322

Diamond specifications and retailer prices

From £1,655 GBP
As of November 6, 2026
Save £2,970 GBP (64%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £4,625 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 J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5553650322. Listed at 16 retailers as of November 5, 2026, with prices from £1,655 to £4,625, a £2,970 spread on the same certified stone. NZ Jewellers lists it at £4,625. 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
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5553650322
Dimensions6.81 × 6.85 × 4.25 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal
Top View
6.81 mm6.85 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5553650322
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.3%

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: £4,625 GBP|Low: £1,549 GBP|High: £4,625 GBP|Avg: £2,411 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 8£1,655 GBP
Retailer 3£1,771 GBP
Retailer 4£1,794 GBP
Retailer 10£1,849 GBP
Retailer 5£2,004 GBP
Retailer 12£2,081 GBP
Retailer 9£2,288 GBP
Retailer 13£2,288 GBP
Retailer 2£2,328 GBP
Retailer 11£2,363 GBP
Retailer 7£2,579 GBP
Retailer 6£3,689 GBP
NZ Jewellers£4,625 GBP

43 data points across 13 retailers

16 retailers£1,655 GBP to £4,625 GBP

B+
Cheapest Retailer
-
£1,655 GBP
B+
Retailer 2
-
£1,794 GBP
View
B+
Retailer 3
-
£1,849 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,882 GBP
View
Retailer 5
-
£2,004 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£2,004 GBP
View
B
Retailer 7
-
£2,081 GBP
View
B+
Retailer 8
-
£2,288 GBP
View
B+
Retailer 9
-
£2,288 GBP
View
B+
Retailer 10
-
£2,312 GBP
View
B+
Retailer 11
-
£2,328 GBP
View
B
Retailer 12
-
£2,363 GBP
View
Retailer 13
-
£2,568 GBP
View
Price last confirmed 14 days ago
B
Retailer 14
-
£2,579 GBP
View
B
Retailer 15
-
£3,689 GBP
View
Most Expensive
B
NZ Jewellers
cf5b448f-3b88-4520-b6d7-a4918f74acfe · Nov 5
£4,625 GBP
$6,225 USD
View
15 more retailers have this diamond
Prices start from £1,655 GBPSave up to £2,970 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
£1,655 GBP