CaratHunter
Plans
Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 1242005145

Certificate GIA 1242005145

Diamond specifications and retailer prices

From $4,452 AUD
As of November 6, 2026
Save $5,565 AUD (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $11,940 AUD at NZ Jewellers · As of September 25, 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 1242005145. Listed at 16 retailers as of November 4, 2026, with a 125% 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 1242005145
Dimensions7.02 × 7.91 × 4.55 mm
L/W Ratio1.13
Girdle conditionFaceted
Top View
7.02 mm7.91 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1242005145
Side View
Table 58.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 57.5%

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: $5,154 AUD|Low: $4,378 AUD|High: $10,441 AUD|Avg: $6,509 AUD|-6.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 12$4,452 AUD
Retailer 8$5,072 AUD
Retailer 1$5,154 AUD
Retailer 11$5,439 AUD
Retailer 3$5,443 AUD
Retailer 13$5,544 AUD
Retailer 6$5,615 AUD
Retailer 7$5,676 AUD
Retailer 5$5,918 AUD
Retailer 2$6,608 AUD
Retailer 9$7,331 AUD
Retailer 4$9,408 AUD
Retailer 10$10,018 AUD

28 data points across 13 retailers

16 retailers$4,452 AUD to $10,018 AUD

A
Cheapest Retailer
-
$4,452 AUD
A
Retailer 2
-
$5,072 AUD
View
A
Retailer 3
-
$5,154 AUD
View
A
Retailer 4
-
$5,439 AUD
View
A
Retailer 5
-
$5,443 AUD
View
A
Retailer 6
-
$5,544 AUD
View
Final sale: no returns
A
Retailer 7
-
$5,615 AUD
View
A
Retailer 8
-
$5,676 AUD
View
A
Retailer 9
-
$5,918 AUD
View
B+
Retailer 10
-
$6,608 AUD
View
Retailer 11
-
$6,718 AUD
View
Price last confirmed 28 days ago
B+
Retailer 12
-
$6,903 AUD
View
B+
Retailer 13
-
$7,331 AUD
View
B+
Retailer 14
-
$9,408 AUD
View
B
Retailer 15
-
$10,018 AUD
View
Most Expensive
NZ Jewellers
028c2f82-29df-442d-9e7a-e4c4f55a4700 · Sep 25
$11,940 AUD
$8,204 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from $4,452 AUDSave up to $5,565 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
$4,452 AUD