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Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 6545059504

Certificate GIA 6545059504

Diamond specifications and retailer prices

From $4,937 AUD
As of November 6, 2026
Save $5,411 AUD (52%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $11,428 AUD at NZ Jewellers · As of October 18, 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 6545059504. Listed at 17 retailers as of November 4, 2026, with a 110% 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6545059504
Dimensions7.10 × 8.01 × 4.70 mm
L/W Ratio1.13
Top View
7.10 mm8.01 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6545059504
Side View
Table 63.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 58.7%

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: $11,428 AUD|Low: $4,918 AUD|High: $11,428 AUD|Avg: $7,082 AUD
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 10$4,937 AUD
Retailer 8$5,082 AUD
Retailer 2$5,241 AUD
Retailer 5$6,267 AUD
Retailer 3$6,559 AUD
Retailer 6$6,599 AUD
Retailer 4$6,657 AUD
Retailer 11$6,731 AUD
Retailer 12$7,568 AUD
Retailer 7$7,948 AUD
Retailer 9$10,348 AUD
NZ Jewellers$11,428 AUD

38 data points across 12 retailers

17 retailers$4,937 AUD to $10,348 AUD

A
Cheapest Retailer
-
$4,937 AUD
A
Retailer 2
-
$5,082 AUD
View
A
Retailer 3
-
$5,241 AUD
View
A
Retailer 4
-
$6,078 AUD
View
A
Retailer 5
-
$6,084 AUD
View
A
Retailer 6
-
$6,267 AUD
View
B+
Retailer 7
-
$6,440 AUD
View
Retailer 8
-
$6,559 AUD
View
Price last confirmed 21 days ago
Retailer 9
-
$6,559 AUD
View
Price last confirmed 19 days ago
Retailer 10
-
$6,559 AUD
View
Price last confirmed 21 days ago
A
Retailer 11
-
$6,599 AUD
View
Retailer 12
-
$6,657 AUD
View
Price last confirmed 28 days ago
B+
Retailer 13
-
$6,731 AUD
View
Retailer 14
-
$7,568 AUD
View
Price last confirmed 18 days ago
B+
Retailer 15
-
$7,948 AUD
View
B
Retailer 16
-
$10,348 AUD
View
Most Expensive
NZ Jewellers
29995b69-3b95-4f88-9472-791e51011cc6 · Oct 18
$11,428 AUD
$7,852 USD
View
Price last confirmed 19 days ago
16 more retailers have this diamond
Prices start from $4,937 AUDSave up to $5,411 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
$4,937 AUD