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Round|Natural|GIA

1.25ct K I1 Round Natural Diamond

EX • K/I1 • GIA 1428549226

Certificate GIA 1428549226

Diamond specifications and retailer prices

From $2,078 AUD
As of November 4, 2026
Save $1,451 AUD (41%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $6,354 AUD at NZ Jewellers · As of September 28, 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 K colour (faint-tinted) and I1 clarity (included), with a top-tier cut grade and certified by GIA 1428549226. Listed at 8 retailers as of November 4, 2026, with a 70% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.25
Carat
K
Colour
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1428549226
Dimensions6.86 × 6.82 × 4.33 mm
L/W Ratio1.01
Star length55%
Lower girdle75%
Culet sizeNone
Top View
6.86 mm6.82 mm1.25 ctK / I1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 1428549226
Side View
Table 56.0%Crown 36°Girdle: THN-STKPavilion 41.2°Culet: NoneDepth 63.3%

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 4
Current: $3,530 AUD|Low: $2,078 AUD|High: $3,548 AUD|Avg: $2,523 AUD|+1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 2$2,078 AUD
Retailer 9$2,096 AUD
Retailer 4$2,188 AUD
Retailer 3$2,338 AUD
Retailer 6$2,360 AUD
Retailer 5$2,468 AUD
Retailer 8$2,548 AUD
Retailer 7$3,100 AUD
Retailer 1$3,530 AUD

13 data points across 9 retailers

8 retailers$2,078 AUD to $3,530 AUD

A
Cheapest Retailer
-
$2,078 AUD
B+
Retailer 2
-
$2,188 AUD
View
B+
Retailer 3
-
$2,338 AUD
View
Retailer 4
-
$2,360 AUD
View
Price last confirmed 36 days ago
B+
Retailer 5
-
$2,548 AUD
View
Retailer 6
-
$2,723 AUD
View
Price last confirmed 38 days ago
B+
Retailer 7
-
$3,530 AUD
View
Most Expensive
NZ Jewellers
6ad9d6b3-af9c-4b84-8c1e-10dbdd6cf29b · Sep 28
$6,354 AUD
$4,448 USD
View
Price last confirmed 39 days ago
7 more retailers have this diamond
Prices start from $2,078 AUDSave up to $1,451 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
$2,078 AUD