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Round|Natural|GIA

1.25ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 6401599815

Certificate GIA 6401599815

Diamond specifications and retailer prices

From $2,820 AUD
$1,981 USD
As of October 26, 2026
Save $2,678 AUD (49%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $6,811 AUD at NZ Jewellers · As of September 19, 2026
View at NZ Jewellers

About this 1.25ct natural round diamond

This 1.25ct 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 6401599815. Listed at 17 retailers as of October 26, 2026, with a 95% 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

1.25
Carat
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6401599815
Dimensions6.86 × 6.83 × 4.32 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.86 mm6.83 mm1.25 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6401599815
Side View
Table 57.0%Crown 35°Girdle: ThickPavilion 41.4°Culet: NoneDepth 63.1%

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: Oct 26
Current: $3,399 AUD|Low: $2,651 AUD|High: $5,715 AUD|Avg: $3,391 AUD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 27, 2026
Retailer 11$2,820 AUD
Retailer 2$2,830 AUD
Retailer 6$2,883 AUD
Retailer 9$2,893 AUD
Retailer 12$2,988 AUD
Retailer 8$3,135 AUD
Retailer 3$3,257 AUD
Retailer 10$3,332 AUD
Retailer 1$3,399 AUD
Retailer 4$3,729 AUD
Retailer 5$3,897 AUD
Retailer 7$5,498 AUD

14 data points across 12 retailers

17 retailers$2,820 AUD to $5,498 AUD

A
Cheapest Retailer
-
$2,820 AUD
$1,981 USD
A
Retailer 2
-
$2,830 AUD
$1,988 USD
View
Retailer 3
-
$2,883 AUD
$2,025 USD
View
Price last confirmed 7 days ago
A
Retailer 4
-
$2,988 AUD
$2,099 USD
View
Retailer 5
-
$3,135 AUD
$2,202 USD
View
Price last confirmed 7 days ago
Retailer 6
-
$3,135 AUD
$2,202 USD
View
Price last confirmed 25 days ago
Retailer 7
-
$3,135 AUD
$2,202 USD
View
Price last confirmed 21 days ago
Retailer 8
-
$3,279 AUD
$2,303 USD
View
Price last confirmed 7 days ago
Retailer 9
-
$3,332 AUD
$2,341 USD
View
Price last confirmed 7 days ago
A
Retailer 10
-
$3,399 AUD
£1,880 GBP
View
Retailer 11
-
$3,616 AUD
$2,540 USD
View
Price last confirmed 28 days ago
Retailer 12
-
$3,758 AUD
$2,640 USD
View
Price last confirmed 40 days ago
B+
Retailer 13
-
$3,897 AUD
€2,607 EUR
View
B
Retailer 14
-
$5,498 AUD
£3,041 GBP
View
Retailer 15
-
$6,553 AUD
$4,603 USD
View
Price last confirmed 29 days ago
Retailer 16
-
$6,553 AUD
$4,603 USD
View
Price last confirmed 21 days ago
Most Expensive
NZ Jewellers
e3228737-f0b4-43d0-9321-c885df49815f · Sep 19
$6,811 AUD
$4,784 USD
View
Price last confirmed 43 days ago
16 more retailers have this diamond
Prices start from $2,820 AUDSave up to $2,678 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
1.25ct Round
$2,820 AUD