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Round|Natural|IGI

1.00ct J IF Round Natural Diamond

EX • J/IF • IGI 680566575

Shape and cutting style on the report: Round brilliant

Certificate IGI 680566575

Diamond specifications and retailer prices

From £1,420 GBP
As of November 6, 2026
Save £1,364 GBP (49%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,520 GBP at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI 680566575. Listed at 14 retailers as of November 4, 2026, with a 96% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.00
Carat
J
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40.6°
OriginNatural
Grading LabIGI
CertificateIGI 680566575
Dimensions6.41 × 6.38 × 3.99 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.41 mm6.38 mm1.00 ctJ / IF
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 680566575
Side View
Table 56.0%Crown 35.8°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
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 6
Current: £1,420 GBP|Low: £1,418 GBP|High: £2,826 GBP|Avg: £1,781 GBP|-7.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1£1,420 GBP
Retailer 2£1,439 GBP
Retailer 8£1,482 GBP
Retailer 9£1,562 GBP
Retailer 10£1,609 GBP
Retailer 6£1,751 GBP
Retailer 3£1,830 GBP
Retailer 5£1,945 GBP
Retailer 4£2,019 GBP
Retailer 7£2,784 GBP

34 data points across 10 retailers

14 retailers£1,420 GBP to £2,784 GBP

A
Cheapest Retailer
-
£1,420 GBP
A
Retailer 2
-
£1,439 GBP
View
A
Retailer 3
-
£1,482 GBP
View
A
Retailer 4
-
£1,562 GBP
View
Retailer 5
-
£1,594 GBP
View
Price last confirmed 30 days ago
A
Retailer 6
-
£1,609 GBP
View
A
Retailer 7
-
£1,751 GBP
View
Retailer 8
-
£1,761 GBP
View
Price last confirmed 38 days ago
A
Retailer 9
-
£1,830 GBP
View
Retailer 10
-
£1,839 GBP
View
Price last confirmed 30 days ago
A
Retailer 11
-
£1,945 GBP
View
A
Retailer 12
-
£2,019 GBP
View
B
Retailer 13
-
£2,784 GBP
View
Most Expensive
NZ Jewellers
cc7705a2-a196-408d-8802-f0c4b19ed7da · Sep 28
£3,520 GBP
$4,737 USD
View
Price last confirmed 39 days ago
13 more retailers have this diamond
Prices start from £1,420 GBPSave up to £1,364 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
1.00ct Round
£1,420 GBP