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Heart|Natural|IGI

1.21ct I SI1 Heart Natural Diamond

VG • I/SI1 • IGI 726507508

Shape and cutting style on the report: Heart brilliant

Certificate IGI 726507508

Diamond specifications and retailer prices

From £1,402 GBP
As of November 5, 2026
Save £1,842 GBP (57%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,245 GBP at NZ Jewellers · As of September 20, 2026
View at NZ Jewellers

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 726507508. Listed at 13 retailers as of November 5, 2026, with a 131% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.21
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle38.6°
Pavilion angle38.7°
OriginNatural
Grading LabIGI
CertificateIGI 726507508
Dimensions6.46 × 7.29 × 4.28 mm
L/W Ratio1.13
Girdle conditionFaceted
Culet sizePointed
Top View
6.46 mm7.29 mm1.21 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateIGI 726507508
Side View
Table 58.0%Crown 38.6°Girdle: MED-STKPavilion 38.7°Culet: NoneDepth 58.7%

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 5
Current: £1,715 GBP|Low: £1,402 GBP|High: £2,752 GBP|Avg: £1,764 GBP|+3.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 4£1,402 GBP
Retailer 6£1,509 GBP
Retailer 7£1,552 GBP
Retailer 5£1,573 GBP
Retailer 1£1,715 GBP
Retailer 2£1,894 GBP
Retailer 3£2,711 GBP

42 data points across 7 retailers

13 retailers£1,402 GBP to £3,245 GBP

A
Cheapest Retailer
-
£1,402 GBP
Retailer 2
-
£1,552 GBP
View
Price last confirmed 46 days ago
B+
Retailer 3
-
£1,552 GBP
View
Retailer 4
-
£1,552 GBP
View
Price last confirmed 9 days ago
B+
Retailer 5
-
£1,573 GBP
View
B+
Retailer 6
-
£1,623 GBP
View
B+
Retailer 7
-
£1,715 GBP
View
Retailer 8
-
£1,791 GBP
View
Price last confirmed 44 days ago
B+
Retailer 9
-
£1,791 GBP
View
B+
Retailer 10
-
£1,894 GBP
View
B
Retailer 11
-
£2,711 GBP
View
C
Retailer 12
-
£3,245 GBP
View
Most Expensive
NZ Jewellers
2a16426c-cd62-4a91-b4ed-b2e3d80f3e91 · Sep 20
£3,245 GBP
$4,343 USD
View
Price last confirmed 47 days ago
12 more retailers have this diamond
Prices start from £1,402 GBPSave up to £1,842 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
1.21ct Heart
£1,402 GBP