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Heart|Natural|GIA

1.59ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 2557582242

Certificate GIA 2557582242

Diamond specifications and retailer prices

From $3,982 AUD
As of November 1, 2026
Save $4,934 AUD (55%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $10,035 AUD at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.59ct natural heart diamond

This 1.59ct natural heart sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2557582242. Listed at 14 retailers as of November 1, 2026, with a 124% 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

1.59
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557582242
Dimensions6.97 × 8.13 × 4.78 mm
L/W Ratio1.17
Girdle conditionFaceted
Top View
6.97 mm8.13 mm1.59 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557582242
Side View
Table 58.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 58.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $5,101 AUD|Low: $3,967 AUD|High: $9,747 AUD|Avg: $5,622 AUD|-3.4%
Retailer 1
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 11$3,982 AUD
Retailer 9$4,023 AUD
Retailer 12$4,276 AUD
Retailer 7$4,350 AUD
Retailer 3$4,471 AUD
Retailer 4$4,679 AUD
Retailer 8$4,963 AUD
Retailer 1$5,101 AUD
Retailer 10$5,493 AUD
Retailer 5$6,526 AUD
Retailer 2$8,239 AUD
Retailer 6$8,916 AUD

39 data points across 12 retailers

14 retailers$3,982 AUD to $8,916 AUD

A
Cheapest Retailer
-
$3,982 AUD
A
Retailer 2
-
$4,023 AUD
View
A
Retailer 3
-
$4,276 AUD
View
A
Retailer 4
-
$4,350 AUD
View
A
Retailer 5
-
$4,471 AUD
View
Final sale: no returns
A
Retailer 6
-
$4,679 AUD
View
A
Retailer 7
-
$4,963 AUD
View
A
Retailer 8
-
$5,101 AUD
View
B+
Retailer 9
-
$5,493 AUD
View
B+
Retailer 10
-
$5,635 AUD
View
B+
Retailer 11
-
$6,526 AUD
View
B
Retailer 12
-
$8,239 AUD
View
B
Retailer 13
-
$8,916 AUD
View
Most Expensive
NZ Jewellers
a4e07a9e-3e48-4ff0-9393-b25ce73f04c1 · Sep 25
$10,035 AUD
$6,895 USD
View
Price last confirmed 42 days ago
13 more retailers have this diamond
Prices start from $3,982 AUDSave up to $4,934 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
1.59ct Heart
$3,982 AUD