Heart|Natural|IGI

0.51ct I SI1 Heart Natural Diamond

VG • I/SI1 • IGI 810634844

Shape and cutting style on the report: Heart brilliant

Certificate IGI 810634844

Diamond specifications and retailer prices

From £282 GBP
As of November 5, 2026
Save £586 GBP (67%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,213 GBP at NZ Jewellers · As of October 21, 2026
View at NZ Jewellers

About this 0.51ct natural heart diamond

This 0.51ct natural heart sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 810634844. Listed at 13 retailers as of November 2, 2026, with a 208% 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

0.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle38.5°
Pavilion angle37.1°
OriginNatural
Grading LabIGI
CertificateIGI 810634844
Dimensions4.84 × 5.55 × 3.12 mm
L/W Ratio1.15
Girdle conditionFaceted
Top View
4.84 mm5.55 mm0.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateIGI 810634844
Side View
Table 61.0%Crown 38.5°Girdle: MED-THKPavilion 37.1°Culet: NoneDepth 56.2%

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: £1,213 GBP|Low: £282 GBP|High: £1,240 GBP|Avg: £513 GBP|-2.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 8£282 GBP
Retailer 4£316 GBP
Retailer 9£332 GBP
Retailer 3£341 GBP
Retailer 6£391 GBP
Retailer 7£467 GBP
Retailer 2£477 GBP
Retailer 10£482 GBP
Retailer 5£499 GBP
Retailer 12£719 GBP
Retailer 11£869 GBP
NZ Jewellers£1,213 GBP

32 data points across 12 retailers

13 retailers£282 GBP to £869 GBP

A
Cheapest Retailer
-
£282 GBP
Retailer 2
-
£316 GBP
View
Price last confirmed 16 days ago
A
Retailer 3
-
£332 GBP
View
Retailer 4
-
£341 GBP
View
Price last confirmed 16 days ago
Retailer 5
-
£344 GBP
View
Price last confirmed 23 days ago
B+
Retailer 6
-
£391 GBP
View
B
Retailer 7
-
£467 GBP
View
B
Retailer 8
-
£477 GBP
View
B
Retailer 9
-
£482 GBP
View
B+
Retailer 10
-
£499 GBP
View
B
Retailer 11
-
£719 GBP
View
C
Retailer 12
-
£869 GBP
View
Most Expensive
NZ Jewellers
6c336c72-22d3-457d-9cf0-2f67feff8eff · Oct 21
£1,213 GBP
$1,624 USD
View
Price under review
12 more retailers have this diamond
Prices start from £282 GBPSave up to £586 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
0.51ct Heart
£282 GBP