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Heart|Natural|GIA

1.31ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 6531769899

Certificate GIA 6531769899

Diamond specifications and retailer prices

From $3,324 AUD
As of November 6, 2026
Save $4,445 AUD (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $9,138 AUD at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.31ct natural heart diamond

This 1.31ct natural heart sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6531769899. Listed at 20 retailers as of November 5, 2026, with a 134% 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

1.31
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.07°
Pavilion angle38.95°
OriginNatural
Grading LabGIA
CertificateGIA 6531769899
Dimensions6.66 × 7.59 × 4.49 mm
L/W Ratio1.14
Top View
6.66 mm7.59 mm1.31 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6531769899
Side View
Table 60.0%Crown 39.07°Girdle: MED-THKPavilion 38.95°Culet: NoneDepth 59.1%

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: Nov 6
Current: $7,769 AUD|Low: $3,324 AUD|High: $9,138 AUD|Avg: $4,837 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 7, 2026
Retailer 10$3,324 AUD
Retailer 5$3,807 AUD
Retailer 15$3,994 AUD
Retailer 14$4,114 AUD
Retailer 13$4,337 AUD
Retailer 7$4,371 AUD
Retailer 16$4,459 AUD
Retailer 9$4,609 AUD
Retailer 4$4,631 AUD
Retailer 12$4,666 AUD
Retailer 8$4,669 AUD
Retailer 3$5,018 AUD
Retailer 6$5,145 AUD
Retailer 11$5,443 AUD
Retailer 2$7,417 AUD
NZ Jewellers$7,769 AUD

33 data points across 16 retailers

20 retailers$3,324 AUD to $7,769 AUD

A
Cheapest Retailer
-
$3,324 AUD
A
Retailer 2
-
$3,807 AUD
View
A
Retailer 3
-
$3,994 AUD
View
A
Retailer 4
-
$4,047 AUD
View
A
Retailer 5
-
$4,114 AUD
View
Final sale: no returns
B+
Retailer 6
-
$4,337 AUD
View
Retailer 7
-
$4,371 AUD
View
Price last confirmed 46 days ago
Retailer 8
-
$4,371 AUD
View
Price last confirmed 9 days ago
A
Retailer 9
-
$4,459 AUD
View
B+
Retailer 10
-
$4,609 AUD
View
B+
Retailer 11
-
$4,631 AUD
View
B+
Retailer 12
-
$4,666 AUD
View
Retailer 13
-
$4,669 AUD
View
Price last confirmed 31 days ago
B+
Retailer 14
-
$5,018 AUD
View
Retailer 15
-
$5,043 AUD
View
Price last confirmed 44 days ago
B+
Retailer 16
-
$5,145 AUD
View
B+
Retailer 17
-
$5,443 AUD
View
B
Retailer 18
-
$7,417 AUD
View
B
Retailer 19
-
$7,769 AUD
View
Most Expensive
NZ Jewellers
95c02344-1a40-4209-bdc5-fe4540743353 · Sep 25
$9,138 AUD
$6,279 USD
View
Price last confirmed 42 days ago
19 more retailers have this diamond
Prices start from $3,324 AUDSave up to $4,445 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
1.31ct Heart
$3,324 AUD