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Round|Natural|IGI

1.30ct I SI1 Round Natural Diamond

EX • I/SI1 • IGI 642467910

Shape and cutting style on the report: Round brilliant

Certificate IGI 642467910

Diamond specifications and retailer prices

From £1,682 GBP
As of November 5, 2026
Save £1,603 GBP (49%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,931 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 1.3ct natural round diamond

This 1.3ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 642467910. Listed at 16 retailers as of November 4, 2026, with a 95% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.30
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.1°
Pavilion angle41.3°
OriginNatural
Grading LabIGI
CertificateIGI 642467910
Dimensions6.93 × 7.00 × 4.35 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.93 mm7.00 mm1.30 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 642467910
Side View
Table 58.0%Crown 36.1°Girdle: MediumPavilion 41.3°Culet: NoneDepth 62.4%

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: £2,013 GBP|Low: £1,663 GBP|High: £3,334 GBP|Avg: £2,069 GBP|+1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 5£1,682 GBP
Retailer 9£1,736 GBP
Retailer 8£1,741 GBP
Retailer 2£1,786 GBP
Retailer 11£1,789 GBP
Retailer 10£1,967 GBP
Retailer 3£1,985 GBP
Retailer 1£2,013 GBP
Retailer 4£2,295 GBP
Retailer 6£2,332 GBP
Retailer 7£3,286 GBP

43 data points across 11 retailers

16 retailers£1,682 GBP to £3,286 GBP

A
Cheapest Retailer
-
£1,682 GBP
A
Retailer 2
-
£1,736 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,741 GBP
View
A
Retailer 4
-
£1,786 GBP
View
A
Retailer 5
-
£1,789 GBP
View
Retailer 6
-
£1,880 GBP
View
Price last confirmed 21 days ago
Retailer 7
-
£1,880 GBP
View
Price last confirmed 17 days ago
A
Retailer 8
-
£1,928 GBP
View
Retailer 9
-
£1,967 GBP
View
Price last confirmed 22 days ago
A
Retailer 10
-
£1,985 GBP
View
A
Retailer 11
-
£2,013 GBP
View
Retailer 12
-
£2,170 GBP
View
Price last confirmed 19 days ago
A
Retailer 13
-
£2,295 GBP
View
A
Retailer 14
-
£2,332 GBP
View
B+
Retailer 15
-
£3,286 GBP
View
Most Expensive
NZ Jewellers
0fe13bdb-e031-434a-a5f2-ccaa9d26e219 · Oct 17
£3,931 GBP
$5,262 USD
View
Price last confirmed 20 days ago
15 more retailers have this diamond
Prices start from £1,682 GBPSave up to £1,603 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
1.30ct Round
£1,682 GBP