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Heart|Natural|IGI

1.23ct J SI1 Heart Natural Diamond

VG • J/SI1 • IGI 704515160

Shape and cutting style on the report: Heart brilliant

Certificate IGI 704515160

Diamond specifications and retailer prices

From £1,028 GBP
As of November 6, 2026
Save £1,733 GBP (63%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £2,761 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.23ct natural heart diamond

This 1.23ct natural heart sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 704515160. Listed at 15 retailers as of November 5, 2026, with prices from £1,028 to £2,761, a £1,733 spread on the same certified stone. NZ Jewellers lists it at £2,761. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.23
Carat
J
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 704515160
Dimensions6.52 × 7.39 × 4.43 mm
L/W Ratio1.13
Girdle conditionFaceted
Culet sizePointed
Top View
6.52 mm7.39 mm1.23 ctJ / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 704515160
Side View
Table 58.0%Crown 35.2°Girdle: STK-THKPavilion 41.1°Culet: NoneDepth 59.9%

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: £2,761 GBP|Low: £1,028 GBP|High: £2,844 GBP|Avg: £1,435 GBP|-2.9%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 2£1,028 GBP
Retailer 8£1,033 GBP
Retailer 9£1,081 GBP
Retailer 3£1,132 GBP
Retailer 7£1,166 GBP
Retailer 5£1,177 GBP
Retailer 6£1,181 GBP
Retailer 4£1,184 GBP
Retailer 15£1,199 GBP
Retailer 10£1,216 GBP
Retailer 11£1,252 GBP
Retailer 12£1,287 GBP
Retailer 13£1,381 GBP
Retailer 14£1,977 GBP
NZ Jewellers£2,761 GBP

32 data points across 15 retailers

15 retailers£1,028 GBP to £2,761 GBP

A
Cheapest Retailer
-
£1,028 GBP
Final sale: no returns
A
Retailer 2
-
£1,033 GBP
View
A
Retailer 3
-
£1,081 GBP
View
A
Retailer 4
-
£1,132 GBP
View
Retailer 5
-
£1,166 GBP
View
Price last confirmed 9 days ago
B+
Retailer 6
-
£1,177 GBP
View
B+
Retailer 7
-
£1,181 GBP
View
A
Retailer 8
-
£1,184 GBP
View
B+
Retailer 9
-
£1,199 GBP
View
B+
Retailer 10
-
£1,216 GBP
View
A
Retailer 11
-
£1,252 GBP
View
B+
Retailer 12
-
£1,287 GBP
View
B+
Retailer 13
-
£1,381 GBP
View
B
Retailer 14
-
£1,977 GBP
View
Most Expensive
B
NZ Jewellers
8ef5a5f5-41e0-40cf-9bc2-8ee8a1456da3 · Nov 5
£2,761 GBP
$3,695 USD
View
14 more retailers have this diamond
Prices start from £1,028 GBPSave up to £1,733 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 Heart
£1,028 GBP