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Round|Natural|GIA

4.25ct K SI1 Round Natural Diamond

EX • K/SI1

Diamond specifications and retailer prices

From $49,586 AUD
As of November 6, 2026
Save $12,204 AUD (20%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $63,803 AUD at Aurelinne · As of October 23, 2026
View at Aurelinne

About this 4.25ct natural round diamond

This 4.25ct natural round sits in the three to five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 15 retailers as of November 6, 2026, with a relatively tight 25% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

4.25
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
Dimensions10.31 × 10.40 × 6.40 mm
L/W Ratio1.01
Top View
10.31 mm10.40 mm4.25 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA
Side View
Table 60.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 61.9%

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: Nov 6
Current: $61,613 AUD|Low: $49,586 AUD|High: $63,921 AUD|Avg: $59,434 AUD|-3.4%
Aurelinne
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 5$49,586 AUD
Retailer 8$55,034 AUD
Retailer 10$56,713 AUD
Retailer 4$56,926 AUD
Retailer 2$57,049 AUD
Retailer 3$57,049 AUD
Retailer 6$59,331 AUD
Retailer 7$59,501 AUD
Aurelinne$61,613 AUD
Retailer 9$61,790 AUD

19 data points across 10 retailers

15 retailers$49,586 AUD to $61,790 AUD

A
Cheapest Retailer
-
$49,586 AUD
Retailer 2
-
$51,327 AUD
View
Price last confirmed 14 days ago
B+
Retailer 3
-
$55,034 AUD
View
Retailer 4
-
$56,713 AUD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$56,926 AUD
View
B+
Retailer 6
-
$57,049 AUD
View
B+
Retailer 7
-
$57,049 AUD
View
Retailer 8
-
$59,077 AUD
View
Price last confirmed 15 days ago
B+
Retailer 9
-
$59,331 AUD
View
B+
Retailer 10
-
$59,501 AUD
View
Retailer 11
-
$61,440 AUD
View
Price last confirmed 15 days ago
Retailer 12
-
$61,553 AUD
View
Price last confirmed 11 days ago
B+
Retailer 13
-
$61,613 AUD
View
B+
Retailer 14
-
$61,790 AUD
View
Most Expensive
Aurelinne
ef843a20-8ae8-4ab8-b564-142ec00080e9 · Oct 23
$63,803 AUD
$44,664 USD
View
Price last confirmed 14 days ago
14 more retailers have this diamond
Prices start from $49,586 AUDSave up to $12,204 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
4.25ct Round
$49,586 AUD