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Heart|Natural|GIA

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 2548532604

Certificate GIA 2548532604

Diamond specifications and retailer prices

From $3,518 AUD
As of November 6, 2026
Save $691 AUD (16%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $4,209 AUD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural heart diamond

This 1.51ct 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 2548532604. Listed at 7 retailers as of November 5, 2026, with prices from $3,518 to $4,209, a $691 spread on the same certified stone. Blue Nile lists it at $4,209. 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
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2548532604
Dimensions6.75 × 8.07 × 4.84 mm
L/W Ratio1.20
Top View
6.75 mm8.07 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2548532604
Side View
Table 61.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 60.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: $4,209 AUD|Low: $3,238 AUD|High: $4,842 AUD|Avg: $3,990 AUD|-13.1%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5$3,518 AUD
Retailer 4$3,561 AUD
Retailer 7$3,608 AUD
Retailer 2$3,698 AUD
Retailer 3$3,780 AUD
Retailer 6$4,088 AUD
Blue Nile$4,209 AUD

42 data points across 7 retailers

7 retailers$3,518 AUD to $4,209 AUD

A
Cheapest Retailer
-
$3,518 AUD
A
Retailer 2
-
$3,561 AUD
View
Final sale: no returns
A
Retailer 3
-
$3,608 AUD
View
A
Retailer 4
-
$3,698 AUD
View
A
Retailer 5
-
$3,780 AUD
View
A
Retailer 6
-
$4,088 AUD
View
Most Expensive
A
Blue Nile
28033762 · Nov 5
$4,209 AUD
$2,892 USD
View
6 more retailers have this diamond
Prices start from $3,518 AUDSave up to $691 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
$3,518 AUD