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Heart|Natural|GIA

0.51ct G SI1 Heart Natural Diamond

VG • G/SI1 • GIA 6515727921

Certificate GIA 6515727921

Diamond specifications and retailer prices

From $736 AUD
As of November 6, 2026
Save $1,291 AUD (64%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $2,752 AUD at NZ Jewellers · As of November 5, 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6515727921. Listed at 18 retailers as of November 2, 2026, with a 175% 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
G
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle37.8°
OriginNatural
Grading LabGIA
CertificateGIA 6515727921
Dimensions5.69 × 5.07 × 2.76 mm
L/W Ratio1.12
Top View
5.69 mm5.07 mm0.51 ctG / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6515727921
Side View
Table 56.0%Crown 36.4°Girdle: STK-THKPavilion 37.8°Culet: NoneDepth 54.5%

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 6
Current: $2,752 AUD|Low: $736 AUD|High: $3,500 AUD|Avg: $1,201 AUD|-21.4%
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
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 7, 2026
Retailer 18$736 AUD
Retailer 4$786 AUD
Retailer 7$809 AUD
Retailer 13$848 AUD
Retailer 5$878 AUD
Retailer 9$945 AUD
Retailer 17$945 AUD
Retailer 19$1,013 AUD
Retailer 2$1,067 AUD
Retailer 6$1,068 AUD
Retailer 12$1,071 AUD
Retailer 8$1,077 AUD
Retailer 16$1,099 AUD
Retailer 3$1,157 AUD
Retailer 10$1,215 AUD
Retailer 14$1,354 AUD
Retailer 11$1,546 AUD
Retailer 15$2,027 AUD
NZ Jewellers$2,752 AUD

23 data points across 19 retailers

18 retailers$736 AUD to $2,027 AUD

A
Cheapest Retailer
-
$736 AUD
B+
Retailer 2
-
$786 AUD
View
B+
Retailer 3
-
$809 AUD
View
Final sale: no returns
B+
Retailer 4
-
$848 AUD
View
B+
Retailer 5
-
$878 AUD
View
Retailer 6
-
$945 AUD
View
Price last confirmed 9 days ago
B
Retailer 7
-
$945 AUD
View
B+
Retailer 8
-
$1,013 AUD
View
B
Retailer 9
-
$1,067 AUD
View
B
Retailer 10
-
$1,068 AUD
View
B+
Retailer 11
-
$1,071 AUD
View
B
Retailer 12
-
$1,077 AUD
View
B
Retailer 13
-
$1,099 AUD
View
B
Retailer 14
-
$1,157 AUD
View
B
Retailer 15
-
$1,215 AUD
View
B
Retailer 16
-
$1,354 AUD
View
B
Retailer 17
-
$2,027 AUD
View
Most Expensive
NZ Jewellers
94ee7a14-1ad9-4429-8ee3-e09098f90f44 · Nov 5
$2,752 AUD
$1,891 USD
View
Price under review
17 more retailers have this diamond
Prices start from $736 AUDSave up to $1,291 AUD

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
$736 AUD