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Round|Natural|IGI

1.23ct J IF Round Natural Diamond

EX • J/IF • IGI 627491779

Shape and cutting style on the report: Round brilliant

Certificate IGI 627491779

Diamond specifications and retailer prices

From £1,908 GBP
$2,556 USD
As of October 30, 2026
Save £2,546 GBP (57%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £4,454 GBP at NZ Jewellers · As of September 21, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct 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 627491779. Listed at 18 retailers as of October 30, 2026, with a 133% 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

1.23
Carat
J
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.7°
OriginNatural
Grading LabIGI
CertificateIGI 627491779
Dimensions6.96 × 6.88 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
6.96 mm6.88 mm1.23 ctJ / IF
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 627491779
Side View
Table 59.0%Crown 34.3°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 60.6%

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: Oct 30
Current: £4,454 GBP|Low: £1,908 GBP|High: £4,570 GBP|Avg: £2,571 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 3£1,908 GBP
Retailer 9£1,937 GBP
Retailer 7£2,086 GBP
Retailer 8£2,130 GBP
Retailer 11£2,130 GBP
Retailer 4£2,305 GBP
Retailer 10£2,493 GBP
Retailer 5£2,494 GBP
Retailer 2£2,619 GBP
Retailer 6£3,752 GBP
NZ Jewellers£4,454 GBP

37 data points across 11 retailers

18 retailers£1,908 GBP to £4,454 GBP

A
Cheapest Retailer
-
£1,908 GBP
$2,556 USD
A
Retailer 2
-
£1,937 GBP
$2,596 USD
View
Retailer 3
-
£2,061 GBP
$2,761 USD
View
Price last confirmed 97 days ago
A
Retailer 4
-
£2,086 GBP
$2,795 USD
View
Retailer 5
-
£2,130 GBP
$2,854 USD
View
Price last confirmed 51 days ago
Retailer 6
-
£2,130 GBP
$2,854 USD
View
Price last confirmed 39 days ago
A
Retailer 7
-
£2,130 GBP
$2,854 USD
View
A
Retailer 8
-
£2,130 GBP
$2,854 USD
View
A
Retailer 9
-
£2,305 GBP
View
Retailer 10
-
£2,458 GBP
$3,294 USD
View
Price last confirmed 55 days ago
Retailer 11
-
£2,458 GBP
$3,294 USD
View
Price last confirmed 40 days ago
A
Retailer 12
-
£2,493 GBP
View
A
Retailer 13
-
£2,494 GBP
€3,183 EUR
View
B+
Retailer 14
-
£2,619 GBP
ZAR 56,683 ZAR
View
B
Retailer 15
-
£3,752 GBP
View
Retailer 16
-
£4,454 GBP
$5,968 USD
View
Price last confirmed 52 days ago
B
Retailer 17
-
£4,454 GBP
$5,968 USD
View
Most Expensive
NZ Jewellers
89f197e9-43bb-453c-ac5d-c579ccc2a5d9 · Sep 21
£4,454 GBP
$5,968 USD
View
Price last confirmed 41 days ago
17 more retailers have this diamond
Prices start from £1,908 GBPSave up to £2,546 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
1.23ct Round
£1,908 GBP