CaratHunter
Plans
Round|Natural|GIA

1.28ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 7508739948

Certificate GIA 7508739948

Diamond specifications and retailer prices

From $3,280 AUD
$2,304 USD
As of October 31, 2026
Save $4,150 AUD (56%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $7,430 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 7508739948. Listed at 6 retailers as of October 30, 2026, with prices from $3,280 to $7,430, a $4,150 spread on the same certified stone. NZ Jewellers lists it at $7,430. 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
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 7508739948
Dimensions6.90 × 6.93 × 4.34 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Key to symbols
Cloud, Crystal, Feather, Needle, Indented Natural, Natural
Top View
6.90 mm6.93 mm1.28 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7508739948
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.8%

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: $7,430 AUD|Low: $2,582 AUD|High: $7,430 AUD|Avg: $4,747 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 1, 2026
Retailer 5$3,280 AUD
Retailer 6$3,465 AUD
Retailer 4$4,167 AUD
Retailer 3$4,206 AUD
Retailer 2$6,227 AUD
NZ Jewellers$7,430 AUD

26 data points across 6 retailers

6 retailers$3,280 AUD to $7,430 AUD

A
Cheapest Retailer
-
$3,280 AUD
$2,304 USD
Final sale: no returns
A
Retailer 2
-
$3,465 AUD
$2,434 USD
View
B+
Retailer 3
-
$4,167 AUD
£2,305 GBP
View
B+
Retailer 4
-
$4,206 AUD
€2,814 EUR
View
B
Retailer 5
-
$6,227 AUD
£3,444 GBP
View
Most Expensive
B
NZ Jewellers
2331ba08-7192-4f4c-85cb-9842da7f89c2 · Oct 30
$7,430 AUD
$5,219 USD
View
5 more retailers have this diamond
Prices start from $3,280 AUDSave up to $4,150 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 Round
$3,280 AUD