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Heart|Natural|GIA

1.28ct I SI1 Heart Natural Diamond

ID • I/SI1 • GIA 1553609111

Certificate GIA 1553609111

Diamond specifications and retailer prices

From $2,851 AUD
As of November 6, 2026
Save $3,737 AUD (57%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $8,376 AUD at NZ Jewellers · As of October 6, 2026
View at NZ Jewellers

About this 1.28ct natural heart diamond

This 1.28ct 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 1553609111. Listed at 12 retailers as of November 6, 2026, with a 131% 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

1.28
Carat
I
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1553609111
Dimensions6.72 × 7.53 × 4.41 mm
L/W Ratio1.12
Girdle conditionThick
Top View
6.72 mm7.53 mm1.28 ctI / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1553609111
Side View
Table 58.0%CrownGirdle: MediumPavilionCulet: NoneDepth 58.6%

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: $6,589 AUD|Low: $2,851 AUD|High: $7,102 AUD|Avg: $4,245 AUD|-7.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 6$2,851 AUD
Retailer 11$3,032 AUD
Retailer 10$3,385 AUD
Retailer 2$3,681 AUD
Retailer 5$3,740 AUD
Retailer 8$3,985 AUD
Retailer 4$3,989 AUD
Retailer 3$4,488 AUD
Retailer 9$4,615 AUD
Retailer 7$4,695 AUD
Retailer 1$6,589 AUD

32 data points across 11 retailers

12 retailers$2,851 AUD to $6,589 AUD

A
Cheapest Retailer
-
$2,851 AUD
A
Retailer 2
-
$3,032 AUD
View
Final sale: no returns
A
Retailer 3
-
$3,385 AUD
View
A
Retailer 4
-
$3,681 AUD
View
A
Retailer 5
-
$3,740 AUD
View
A
Retailer 6
-
$3,985 AUD
View
A
Retailer 7
-
$3,989 AUD
View
Retailer 8
-
$4,488 AUD
View
Price last confirmed 31 days ago
B+
Retailer 9
-
$4,615 AUD
View
B+
Retailer 10
-
$4,695 AUD
View
Retailer 11
-
$6,589 AUD
View
Most Expensive
NZ Jewellers
54e56388-8c9f-41d1-b62b-9fec14c0741f · Oct 6
$8,376 AUD
$5,755 USD
View
Price last confirmed 31 days ago
11 more retailers have this diamond
Prices start from $2,851 AUDSave up to $3,737 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
1.28ct Heart
$2,851 AUD