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Heart|Natural|GIA

1.51ct J SI1 Heart Natural Diamond

ID • J/SI1 • GIA 6521863768

Certificate GIA 6521863768

Diamond specifications and retailer prices

From $5,123 AUD
As of November 6, 2026
Save $5,832 AUD (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $12,572 AUD at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6521863768. Listed at 20 retailers as of November 4, 2026, with a 114% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6521863768
Dimensions6.88 × 8.00 × 4.76 mm
L/W Ratio1.16
Top View
6.88 mm8.00 mm1.51 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6521863768
Side View
Table 60.0%Crown 34.6°Girdle: MD-VTKPavilion 41.6°Culet: NoneDepth 59.5%

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: $12,016 AUD|Low: $5,066 AUD|High: $12,572 AUD|Avg: $7,395 AUD|-4.4%
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
November 7, 2026
Retailer 11$5,123 AUD
Retailer 7$5,889 AUD
Retailer 15$6,015 AUD
Retailer 3$6,133 AUD
Retailer 13$6,366 AUD
Retailer 6$6,503 AUD
Retailer 12$6,506 AUD
Retailer 2$6,791 AUD
Retailer 14$6,897 AUD
Retailer 16$6,952 AUD
Retailer 5$7,115 AUD
Retailer 8$7,216 AUD
Retailer 4$7,958 AUD
Retailer 9$8,415 AUD
Retailer 10$10,955 AUD
NZ Jewellers$12,016 AUD

45 data points across 16 retailers

20 retailers$5,123 AUD to $10,955 AUD

A
Cheapest Retailer
-
$5,123 AUD
Retailer 2
-
$5,889 AUD
View
Price last confirmed 20 days ago
B+
Retailer 3
-
$6,015 AUD
View
B+
Retailer 4
-
$6,133 AUD
View
B+
Retailer 5
-
$6,366 AUD
View
Final sale: no returns
Retailer 6
-
$6,503 AUD
View
Price last confirmed 12 days ago
B+
Retailer 7
-
$6,506 AUD
View
B+
Retailer 8
-
$6,791 AUD
View
Retailer 9
-
$6,897 AUD
View
Price last confirmed 22 days ago
Retailer 10
-
$6,897 AUD
View
Price last confirmed 18 days ago
Retailer 11
-
$6,897 AUD
View
Price last confirmed 22 days ago
Retailer 12
-
$6,952 AUD
View
Price last confirmed 29 days ago
B+
Retailer 13
-
$7,115 AUD
View
Retailer 14
-
$7,216 AUD
View
Price last confirmed 45 days ago
Retailer 15
-
$7,958 AUD
View
Price last confirmed 17 days ago
Retailer 16
-
$8,326 AUD
View
Price last confirmed 39 days ago
B
Retailer 17
-
$8,415 AUD
View
B
Retailer 18
-
$10,955 AUD
View
Retailer 19
-
$12,016 AUD
View
Price last confirmed 17 days ago
Most Expensive
NZ Jewellers
91a3da5e-28a1-40c3-b827-2b2d66af564d · Sep 28
$12,572 AUD
$8,638 USD
View
Price last confirmed 40 days ago
19 more retailers have this diamond
Prices start from $5,123 AUDSave up to $5,832 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
1.51ct Heart
$5,123 AUD