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Round|Natural|IGI

1.29ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 678518039

Shape and cutting style on the report: Round brilliant

Certificate IGI 678518039

Diamond specifications and retailer prices

From £670 GBP
₹85,561 INR
As of November 1, 2026
Save £902 GBP (57%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £2,093 GBP at NZ Jewellers · As of September 26, 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 J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 678518039. Listed at 15 retailers as of November 1, 2026, with a 135% 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

1.29
Carat
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41.3°
OriginNatural
Grading LabIGI
CertificateIGI 678518039
Dimensions6.90 × 6.86 × 4.36 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
6.90 mm6.86 mm1.29 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 678518039
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 41.3°Culet: NoneDepth 63.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £670 GBP|Low: £669 GBP|High: £1,591 GBP|Avg: £1,037 GBP|-2.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 1, 2026
Retailer 1£670 GBP
Retailer 5£822 GBP
Retailer 2£826 GBP
Retailer 4£1,197 GBP
Retailer 3£1,572 GBP

44 data points across 5 retailers

15 retailers£670 GBP to £1,572 GBP

A
Cheapest Retailer
-
£670 GBP
₹85,561 INR
Retailer 2
-
£817 GBP
$1,094 USD
View
Price last confirmed 91 days ago
A
Retailer 3
-
£822 GBP
$1,102 USD
View
A
Retailer 4
-
£826 GBP
View
Retailer 5
-
£858 GBP
$1,150 USD
View
Price last confirmed 45 days ago
Retailer 6
-
£858 GBP
$1,150 USD
View
Price last confirmed 25 days ago
Retailer 7
-
£858 GBP
$1,150 USD
View
Price last confirmed 25 days ago
Retailer 8
-
£891 GBP
$1,194 USD
View
Price last confirmed 33 days ago
A
Retailer 9
-
£959 GBP
$1,284 USD
View
Retailer 10
-
£990 GBP
$1,327 USD
View
Price last confirmed 41 days ago
Retailer 11
-
£990 GBP
$1,327 USD
View
Price last confirmed 23 days ago
A
Retailer 12
-
£1,197 GBP
€1,527 EUR
View
A
Retailer 13
-
£1,572 GBP
View
Retailer 14
-
£2,093 GBP
$2,805 USD
View
Price last confirmed 41 days ago
Most Expensive
NZ Jewellers
3888afb2-bcee-4462-95a8-39e6533ce625 · Sep 26
£2,093 GBP
$2,805 USD
View
Price last confirmed 36 days ago
14 more retailers have this diamond
Prices start from £670 GBPSave up to £902 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
£670 GBP