CaratHunter
Plans
Heart|Natural|GIA

0.51ct G SI1 Heart Natural Diamond

VG • G/SI1 • GIA 6515727921

Certificate GIA 6515727921

Diamond specifications and retailer prices

From $913 NZD
As of November 6, 2026
Save $1,600 NZD (64%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $3,411 NZD 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: $3,411 NZD|Low: $913 NZD|High: $4,338 NZD|Avg: $1,489 NZD|-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$913 NZD
Retailer 4$974 NZD
Retailer 7$1,003 NZD
Retailer 13$1,052 NZD
Retailer 5$1,088 NZD
Retailer 9$1,171 NZD
Retailer 17$1,171 NZD
Retailer 19$1,256 NZD
Retailer 2$1,322 NZD
Retailer 6$1,324 NZD
Retailer 12$1,328 NZD
Retailer 8$1,335 NZD
Retailer 16$1,362 NZD
Retailer 3$1,434 NZD
Retailer 10$1,506 NZD
Retailer 14$1,678 NZD
Retailer 11$1,916 NZD
Retailer 15$2,513 NZD
NZ Jewellers$3,411 NZD

23 data points across 19 retailers

18 retailers$913 NZD to $2,513 NZD

A
Cheapest Retailer
-
$913 NZD
B+
Retailer 2
-
$974 NZD
View
B+
Retailer 3
-
$1,003 NZD
View
Final sale: no returns
B+
Retailer 4
-
$1,052 NZD
View
B+
Retailer 5
-
$1,088 NZD
View
Retailer 6
-
$1,171 NZD
View
Price last confirmed 9 days ago
B
Retailer 7
-
$1,171 NZD
View
B+
Retailer 8
-
$1,256 NZD
View
B
Retailer 9
-
$1,322 NZD
View
B
Retailer 10
-
$1,324 NZD
View
B+
Retailer 11
-
$1,328 NZD
View
B
Retailer 12
-
$1,335 NZD
View
B
Retailer 13
-
$1,362 NZD
View
B
Retailer 14
-
$1,434 NZD
View
B
Retailer 15
-
$1,506 NZD
View
B
Retailer 16
-
$1,678 NZD
View
B
Retailer 17
-
$2,513 NZD
View
Most Expensive
NZ Jewellers
94ee7a14-1ad9-4429-8ee3-e09098f90f44 · Nov 5
$3,411 NZD
$1,891 USD
View
Price under review
17 more retailers have this diamond
Prices start from $913 NZDSave up to $1,600 NZD

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
$913 NZD