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1.03ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 320829434

Shape and cutting style on the report: Round brilliant

Certificate IGI 320829434

Diamond specifications and retailer prices

From £981 GBP
As of November 5, 2026
Save £1,600 GBP (62%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £2,580 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 320829434. Listed at 16 retailers as of November 5, 2026, with prices from £981 to £2,580, a £1,600 spread on the same certified stone. NZ Jewellers lists it at £2,580. 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
FluorescenceFaint
Crown angle34.3°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 320829434
Dimensions6.49 × 6.51 × 3.97 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.49 mm6.51 mm1.03 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 320829434
Side View
Table 58.5%Crown 34.3°Girdle: Med.Pavilion 40.8°Culet: NoneDepth 61.1%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £998 GBP|Low: £997 GBP|High: £1,961 GBP|Avg: £1,433 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 1£998 GBP
Retailer 2£1,181 GBP
Retailer 4£1,291 GBP
Retailer 7£1,447 GBP
Retailer 3£1,464 GBP
Retailer 6£1,467 GBP
Retailer 8£1,723 GBP
Retailer 5£1,932 GBP

34 data points across 8 retailers

16 retailers£981 GBP to £2,580 GBP

A
Cheapest Retailer
-
£981 GBP
A
Retailer 2
-
£998 GBP
View
A
Retailer 3
-
£1,058 GBP
View
A
Retailer 4
-
£1,106 GBP
View
A
Retailer 5
-
£1,133 GBP
View
A
Retailer 6
-
£1,158 GBP
View
A
Retailer 7
-
£1,181 GBP
View
B+
Retailer 8
-
£1,221 GBP
View
B+
Retailer 9
-
£1,291 GBP
View
B+
Retailer 10
-
£1,447 GBP
View
B+
Retailer 11
-
£1,464 GBP
View
B+
Retailer 12
-
£1,467 GBP
View
B+
Retailer 13
-
£1,723 GBP
View
B
Retailer 14
-
£1,771 GBP
View
B
Retailer 15
-
£1,932 GBP
View
Most Expensive
B
NZ Jewellers
d73b867d-c73d-4f10-9083-f3f8b6bc4ade · Nov 5
£2,580 GBP
$3,473 USD
View
15 more retailers have this diamond
Prices start from £981 GBPSave up to £1,600 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
£981 GBP