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Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 3555728617

Certificate GIA 3555728617

Diamond specifications and retailer prices

From $4,844 AUD
As of November 6, 2026
Save $6,559 AUD (58%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $11,403 AUD at NZ Jewellers · As of November 5, 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 I 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 3555728617. Listed at 10 retailers as of November 5, 2026, with prices from $4,844 to $11,403, a $6,559 spread on the same certified stone. NZ Jewellers lists it at $11,403. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle34.89°
OriginNatural
Grading LabGIA
CertificateGIA 3555728617
Dimensions7.56 × 8.04 × 4.05 mm
L/W Ratio1.06
Key to symbols
Twinning Wisp, Feather, Crystal
Top View
7.56 mm8.04 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 3555728617
Side View
Table 55.0%CrownGirdle: STK-VTKPavilion 34.89°Culet: NoneDepth 53.6%

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: $11,403 AUD|Low: $4,844 AUD|High: $12,550 AUD|Avg: $7,515 AUD|-9.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9$4,844 AUD
Retailer 5$5,580 AUD
Retailer 8$5,816 AUD
Retailer 3$6,104 AUD
Retailer 6$6,545 AUD
Retailer 7$6,545 AUD
Retailer 10$7,065 AUD
Retailer 2$7,485 AUD
Retailer 4$10,396 AUD
NZ Jewellers$11,403 AUD

41 data points across 10 retailers

10 retailers$4,844 AUD to $11,403 AUD

A
Cheapest Retailer
-
$4,844 AUD
A
Retailer 2
-
$5,580 AUD
View
A
Retailer 3
-
$5,816 AUD
View
A
Retailer 4
-
$6,104 AUD
View
B+
Retailer 5
-
$6,545 AUD
View
A
Retailer 6
-
$6,545 AUD
View
B+
Retailer 7
-
$7,065 AUD
View
B+
Retailer 8
-
$7,485 AUD
View
B
Retailer 9
-
$10,396 AUD
View
Most Expensive
B
NZ Jewellers
5ee50bfa-4b5f-4949-8ef4-69ff66f075be · Nov 5
$11,403 AUD
$7,835 USD
View
9 more retailers have this diamond
Prices start from $4,844 AUDSave up to $6,559 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
$4,844 AUD