CaratHunter
Plans
Heart|Natural|GIA

1.51ct I SI2 Heart Natural Diamond

EX • I/SI2 • GIA 6552596091

Certificate GIA 6552596091

Diamond specifications and retailer prices

From $4,154 AUD
As of November 6, 2026
Save $5,007 AUD (55%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $9,636 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6552596091. Listed at 13 retailers as of November 4, 2026, with a 121% 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6552596091
Dimensions7.07 × 8.05 × 4.73 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Needle, Indented Natural
Top View
7.07 mm8.05 mm1.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552596091
Side View
Table 60.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 58.8%

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: $4,385 AUD|Low: $4,135 AUD|High: $10,214 AUD|Avg: $5,959 AUD|-10.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5$4,154 AUD
Retailer 1$4,385 AUD
Retailer 7$5,071 AUD
Retailer 3$5,312 AUD
Retailer 2$5,685 AUD
Retailer 6$5,705 AUD
Retailer 4$9,160 AUD

45 data points across 7 retailers

13 retailers$4,154 AUD to $9,160 AUD

A
Cheapest Retailer
-
$4,154 AUD
A
Retailer 2
-
$4,385 AUD
View
A
Retailer 3
-
$5,071 AUD
View
Final sale: no returns
A
Retailer 4
-
$5,312 AUD
View
Retailer 5
-
$5,531 AUD
View
Price last confirmed 22 days ago
Retailer 6
-
$5,531 AUD
View
Price last confirmed 20 days ago
A
Retailer 7
-
$5,542 AUD
View
A
Retailer 8
-
$5,685 AUD
View
A
Retailer 9
-
$5,705 AUD
View
Retailer 10
-
$5,743 AUD
View
Price last confirmed 22 days ago
Retailer 11
-
$6,382 AUD
View
Price last confirmed 19 days ago
B+
Retailer 12
-
$9,160 AUD
View
Most Expensive
NZ Jewellers
c725a9b8-881d-4e8d-8d4d-ccdb7f702b80 · Oct 18
$9,636 AUD
$6,621 USD
View
Price last confirmed 20 days ago
12 more retailers have this diamond
Prices start from $4,154 AUDSave up to $5,007 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
$4,154 AUD