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Heart|Natural|HRD

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • HRD 250000199722

Certificate HRD 250000199722

Diamond specifications and retailer prices

From $3,535 AUD
As of November 6, 2026
Save $4,079 AUD (54%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $7,615 AUD at NZ Jewellers · As of November 3, 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 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 HRD 250000199722. Listed at 5 retailers as of November 3, 2026, with prices from $3,535 to $7,615, a $4,079 spread on the same certified stone. NZ Jewellers lists it at $7,615. 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
SymmetryVery Good
FluorescenceNone
Crown angle35.03°
Pavilion angle40.1°
OriginNatural
Grading LabHRD
CertificateHRD 250000199722
Dimensions6.97 × 8.20 × 4.61 mm
L/W Ratio1.18
Girdle conditionMedium
Top View
6.97 mm8.20 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateHRD 250000199722
Side View
Table 63.0%Crown 35.03°GirdlePavilion 40.1°CuletDepth 56.2%

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 6
Current: $7,615 AUD|Low: $3,535 AUD|High: $7,885 AUD|Avg: $5,066 AUD|-3.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 5$3,535 AUD
Retailer 3$3,643 AUD
Retailer 4$3,810 AUD
Retailer 6$4,571 AUD
Retailer 2$6,382 AUD
NZ Jewellers$7,615 AUD

15 data points across 6 retailers

5 retailers$3,535 AUD to $7,615 AUD

A
Cheapest Retailer
-
$3,535 AUD
A
Retailer 2
-
$3,643 AUD
View
B+
Retailer 3
-
$3,810 AUD
View
B
Retailer 4
-
$6,382 AUD
View
Most Expensive
B
NZ Jewellers
1a115bc5-5eb3-444d-a044-44d98997dc21 · Nov 3
$7,615 AUD
$5,232 USD
View
4 more retailers have this diamond
Prices start from $3,535 AUDSave up to $4,079 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
$3,535 AUD