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Heart|Natural|HRD

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • HRD 250000276766

Certificate HRD 250000276766

Diamond specifications and retailer prices

From $3,280 AUD
As of November 1, 2026
Save $3,579 AUD (52%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $6,859 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 250000276766. Listed at 5 retailers as of November 1, 2026, with prices from $3,280 to $6,859, a $3,579 spread on the same certified stone. NZ Jewellers lists it at $6,859. 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 angle36.17°
Pavilion angle41.2°
OriginNatural
Grading LabHRD
CertificateHRD 250000276766
Dimensions7.20 × 8.00 × 4.75 mm
L/W Ratio1.11
Girdle conditionMedium
Top View
7.20 mm8.00 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateHRD 250000276766
Side View
Table 59.0%Crown 36.17°GirdlePavilion 41.2°CuletDepth 59.4%

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: $6,859 AUD|Low: $3,280 AUD|High: $6,998 AUD|Avg: $4,455 AUD|-2.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 3$3,280 AUD
Retailer 5$3,347 AUD
Retailer 4$3,432 AUD
Retailer 7$3,962 AUD
Retailer 6$3,966 AUD
Retailer 2$5,747 AUD
NZ Jewellers$6,859 AUD

12 data points across 7 retailers

5 retailers$3,280 AUD to $6,859 AUD

A
Cheapest Retailer
-
$3,280 AUD
B+
Retailer 2
-
$3,347 AUD
View
A
Retailer 3
-
$3,432 AUD
View
B+
Retailer 4
-
$5,747 AUD
View
Most Expensive
B
NZ Jewellers
b2e90259-6d77-4518-8b11-0fa4efcef192 · Nov 3
$6,859 AUD
$4,713 USD
View
4 more retailers have this diamond
Prices start from $3,280 AUDSave up to $3,579 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
$3,280 AUD