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1.03ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 825677309

Shape and cutting style on the report: Round brilliant

Certificate IGI 825677309

Diamond specifications and retailer prices

From £1,138 GBP
As of November 5, 2026
Save £1,907 GBP (63%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,046 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.03ct natural round diamond

This 1.03ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 825677309. Listed at 14 retailers as of November 5, 2026, with prices from £1,138 to £3,046, a £1,907 spread on the same certified stone. NZ Jewellers lists it at £3,046. 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

1.03
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle40.9°
OriginNatural
Grading LabIGI
CertificateIGI 825677309
Dimensions6.43 × 6.46 × 4.02 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.43 mm6.46 mm1.03 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 825677309
Side View
Table 57.0%Crown 35.4°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.3%

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 5
Current: £1,178 GBP|Low: £1,152 GBP|High: £2,213 GBP|Avg: £1,514 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 7£1,152 GBP
Retailer 1£1,178 GBP
Retailer 2£1,401 GBP
Retailer 3£1,453 GBP
Retailer 5£1,524 GBP
Retailer 4£1,692 GBP
Retailer 6£2,181 GBP

34 data points across 7 retailers

14 retailers£1,138 GBP to £3,046 GBP

A
Cheapest Retailer
-
£1,138 GBP
A
Retailer 2
-
£1,152 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,178 GBP
View
Retailer 4
-
£1,249 GBP
View
Price last confirmed 8 days ago
A
Retailer 5
-
£1,249 GBP
View
A
Retailer 6
-
£1,300 GBP
View
B+
Retailer 7
-
£1,306 GBP
View
B+
Retailer 8
-
£1,401 GBP
View
B+
Retailer 9
-
£1,441 GBP
View
B+
Retailer 10
-
£1,453 GBP
View
B+
Retailer 11
-
£1,524 GBP
View
B+
Retailer 12
-
£1,692 GBP
View
B
Retailer 13
-
£2,181 GBP
View
Most Expensive
B
NZ Jewellers
e61d0523-7643-42e5-af4a-3b1fe5f5a3ac · Nov 5
£3,046 GBP
$4,099 USD
View
13 more retailers have this diamond
Prices start from £1,138 GBPSave up to £1,907 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
1.03ct Round
£1,138 GBP