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Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 2556435166

Certificate GIA 2556435166

Diamond specifications and retailer prices

From $5,573 AUD
As of November 6, 2026
Save $6,430 AUD (54%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $13,580 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 2556435166. Listed at 17 retailers as of November 4, 2026, with a 115% 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
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2556435166
Dimensions6.83 × 7.97 × 4.68 mm
L/W Ratio1.17
Girdle conditionFaceted
Top View
6.83 mm7.97 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556435166
Side View
Table 58.0%CrownGirdle: STK-VTKPavilionCulet: 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: $6,328 AUD|Low: $5,506 AUD|High: $12,751 AUD|Avg: $7,544 AUD|-4.1%
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
Retailer 14
Retailer 15
November 6, 2026
Retailer 5$5,573 AUD
Retailer 3$5,625 AUD
Retailer 12$5,990 AUD
Retailer 6$6,264 AUD
Retailer 11$6,280 AUD
Retailer 4$6,319 AUD
Retailer 1$6,328 AUD
Retailer 14$6,462 AUD
Retailer 15$6,753 AUD
Retailer 8$7,051 AUD
Retailer 2$7,245 AUD
Retailer 7$7,996 AUD
Retailer 9$9,219 AUD
Retailer 13$11,642 AUD
Retailer 10$12,003 AUD

28 data points across 15 retailers

17 retailers$5,573 AUD to $12,003 AUD

A
Cheapest Retailer
-
$5,573 AUD
A
Retailer 2
-
$5,625 AUD
View
A
Retailer 3
-
$5,990 AUD
View
A
Retailer 4
-
$6,264 AUD
View
A
Retailer 5
-
$6,280 AUD
View
A
Retailer 6
-
$6,319 AUD
View
Final sale: no returns
A
Retailer 7
-
$6,328 AUD
View
A
Retailer 8
-
$6,462 AUD
View
B+
Retailer 9
-
$6,753 AUD
View
B+
Retailer 10
-
$7,051 AUD
View
B+
Retailer 11
-
$7,245 AUD
View
Retailer 12
-
$7,996 AUD
View
Price last confirmed 29 days ago
B+
Retailer 13
-
$8,057 AUD
View
B+
Retailer 14
-
$9,219 AUD
View
B
Retailer 15
-
$11,642 AUD
View
B
Retailer 16
-
$12,003 AUD
View
Most Expensive
NZ Jewellers
97ff1fbe-ddc2-4b37-a53f-63da8904c8ed · Sep 25
$13,580 AUD
$9,331 USD
View
Price last confirmed 42 days ago
16 more retailers have this diamond
Prices start from $5,573 AUDSave up to $6,430 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
$5,573 AUD