CaratHunter
Plans
Round|Natural|IGI

1.23ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 833602422

Shape and cutting style on the report: Round brilliant

Certificate IGI 833602422

Diamond specifications and retailer prices

From £820 GBP
As of November 6, 2026
Save £1,867 GBP (69%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £2,687 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 IGI 833602422. Listed at 15 retailers as of November 5, 2026, with prices from £820 to £2,687, a £1,867 spread on the same certified stone. NZ Jewellers lists it at £2,687. 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 angle36.2°
Pavilion angle40.5°
OriginNatural
Grading LabIGI
CertificateIGI 833602422
Dimensions6.83 × 6.89 × 4.18 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
6.83 mm6.89 mm1.23 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 833602422
Side View
Table 61.0%Crown 36.2°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 60.9%

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: £2,687 GBP|Low: £820 GBP|High: £2,687 GBP|Avg: £1,297 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
Retailer 14
Retailer 15
November 6, 2026
Retailer 2£820 GBP
Retailer 3£1,016 GBP
Retailer 12£1,020 GBP
Retailer 6£1,021 GBP
Retailer 8£1,053 GBP
Retailer 7£1,101 GBP
Retailer 13£1,101 GBP
Retailer 4£1,148 GBP
Retailer 15£1,150 GBP
Retailer 14£1,152 GBP
Retailer 5£1,271 GBP
Retailer 10£1,290 GBP
Retailer 9£1,420 GBP
Retailer 11£1,924 GBP
NZ Jewellers£2,687 GBP

41 data points across 15 retailers

15 retailers£820 GBP to £2,687 GBP

A
Cheapest Retailer
-
£820 GBP
A
Retailer 2
-
£1,016 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,020 GBP
View
A
Retailer 4
-
£1,021 GBP
View
A
Retailer 5
-
£1,053 GBP
View
Retailer 6
-
£1,101 GBP
View
Price last confirmed 8 days ago
A
Retailer 7
-
£1,101 GBP
View
B+
Retailer 8
-
£1,148 GBP
View
B+
Retailer 9
-
£1,150 GBP
View
B+
Retailer 10
-
£1,152 GBP
View
B+
Retailer 11
-
£1,271 GBP
View
A
Retailer 12
-
£1,290 GBP
View
A
Retailer 13
-
£1,420 GBP
View
B+
Retailer 14
-
£1,924 GBP
View
Most Expensive
B
NZ Jewellers
34ba6b30-4a1b-4995-bdf9-ad59beae8489 · Nov 5
£2,687 GBP
$3,596 USD
View
14 more retailers have this diamond
Prices start from £820 GBPSave up to £1,867 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
£820 GBP