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1.29ct I SI1 Round Natural Diamond

EX • I/SI1 • IGI 629464478

Shape and cutting style on the report: Round brilliant

Certificate IGI 629464478

Diamond specifications and retailer prices

From £2,224 GBP
As of November 4, 2026
Save £2,140 GBP (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £4,365 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.29ct natural round diamond

This 1.29ct 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 629464478. Listed at 14 retailers as of November 4, 2026, with prices from £2,224 to £4,365, a £2,140 spread on the same certified stone. NZ Jewellers lists it at £4,365. 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

1.29
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle41.2°
OriginNatural
Grading LabIGI
CertificateIGI 629464478
Dimensions6.94 × 6.99 × 4.35 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.94 mm6.99 mm1.29 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 629464478
Side View
Table 55.0%Crown 33.7°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.5%

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 4
Current: £2,339 GBP|Low: £2,312 GBP|High: £4,137 GBP|Avg: £2,853 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 6£2,312 GBP
Retailer 1£2,339 GBP
Retailer 7£2,601 GBP
Retailer 2£2,623 GBP
Retailer 3£2,909 GBP
Retailer 4£3,057 GBP
Retailer 5£4,078 GBP

41 data points across 7 retailers

14 retailers£2,224 GBP to £4,365 GBP

A
Cheapest Retailer
-
£2,224 GBP
A
Retailer 2
-
£2,312 GBP
View
Final sale: no returns
A
Retailer 3
-
£2,339 GBP
View
A
Retailer 4
-
£2,421 GBP
View
Retailer 5
-
£2,505 GBP
View
Price last confirmed 8 days ago
A
Retailer 6
-
£2,505 GBP
View
A
Retailer 7
-
£2,601 GBP
View
B+
Retailer 8
-
£2,613 GBP
View
A
Retailer 9
-
£2,623 GBP
View
B+
Retailer 10
-
£2,891 GBP
View
B+
Retailer 11
-
£2,909 GBP
View
B+
Retailer 12
-
£3,057 GBP
View
B
Retailer 13
-
£4,078 GBP
View
Most Expensive
B
NZ Jewellers
3fecf4c4-363d-416e-babe-884dd73e005d · Nov 5
£4,365 GBP
$5,842 USD
View
13 more retailers have this diamond
Prices start from £2,224 GBPSave up to £2,140 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
1.29ct Round
£2,224 GBP