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Heart|Natural|GIA

1.51ct D SI1 Heart Natural Diamond

ID • D/SI1 • GIA 7551135021

Certificate GIA 7551135021

Diamond specifications and retailer prices

From $8,318 AUD
$5,843 USD
As of October 31, 2026
Save $7,690 AUD (48%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $19,026 AUD at NZ Jewellers · As of October 21, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 7551135021. Listed at 15 retailers as of October 31, 2026, with a 92% 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
D
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 7551135021
Dimensions7.92 × 6.69 × 4.73 mm
L/W Ratio1.18
Culet sizeNone
Key to symbols
Cloud, Feather, Crystal, Needle
Top View
7.92 mm6.69 mm1.51 ctD / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 7551135021
Side View
Table 61.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 59.7%

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: Oct 31
Current: $19,026 AUD|Low: $8,318 AUD|High: $19,026 AUD|Avg: $11,658 AUD
NZ Jewellers
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
Retailer 16
November 2, 2026
Retailer 13$8,318 AUD
Retailer 16$8,742 AUD
Retailer 14$9,512 AUD
Retailer 4$10,008 AUD
Retailer 15$10,305 AUD
Retailer 12$10,465 AUD
Retailer 2$10,747 AUD
Retailer 7$11,503 AUD
Retailer 8$11,503 AUD
Retailer 5$11,620 AUD
Retailer 6$11,887 AUD
Retailer 3$11,891 AUD
Retailer 9$12,547 AUD
Retailer 11$14,111 AUD
Retailer 10$16,008 AUD
NZ Jewellers$19,026 AUD

38 data points across 16 retailers

15 retailers$8,318 AUD to $16,008 AUD

A
Cheapest Retailer
-
$8,318 AUD
$5,843 USD
A
Retailer 2
-
$8,742 AUD
$6,141 USD
View
B+
Retailer 3
-
$10,008 AUD
$7,030 USD
View
Retailer 4
-
$10,305 AUD
$7,239 USD
View
Price last confirmed 10 days ago
Retailer 5
-
$10,465 AUD
$7,351 USD
View
Price last confirmed 10 days ago
B+
Retailer 6
-
$10,747 AUD
£5,944 GBP
View
B+
Retailer 7
-
$11,503 AUD
$8,080 USD
View
B+
Retailer 8
-
$11,503 AUD
$8,080 USD
View
B+
Retailer 9
-
$11,620 AUD
$8,162 USD
View
B+
Retailer 10
-
$11,887 AUD
$8,350 USD
View
Retailer 11
-
$11,891 AUD
$8,353 USD
View
Price last confirmed 10 days ago
B+
Retailer 12
-
$12,547 AUD
€8,394 EUR
View
B
Retailer 13
-
$14,111 AUD
ZAR 160,134 ZAR
View
B
Retailer 14
-
$16,008 AUD
£8,854 GBP
View
Most Expensive
NZ Jewellers
617242c2-413d-471a-8e84-634a2b559113 · Oct 21
$19,026 AUD
$13,365 USD
View
Price last confirmed 12 days ago
14 more retailers have this diamond
Prices start from $8,318 AUDSave up to $7,690 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
$8,318 AUD