Round|Natural|GIA

4.25ct K SI1 Round Natural Diamond

EX • K/SI1

Diamond specifications and retailer prices

From $61,749 NZD
As of November 6, 2026
Save $15,197 NZD (20%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $79,453 NZD 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: $76,726 NZD|Low: $61,749 NZD|High: $79,600 NZD|Avg: $74,012 NZD|-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$61,749 NZD
Retailer 8$68,534 NZD
Retailer 10$70,624 NZD
Retailer 4$70,889 NZD
Retailer 2$71,042 NZD
Retailer 3$71,042 NZD
Retailer 6$73,885 NZD
Retailer 7$74,097 NZD
Aurelinne$76,726 NZD
Retailer 9$76,946 NZD

19 data points across 10 retailers

15 retailers$61,749 NZD to $76,946 NZD

A
Cheapest Retailer
-
$61,749 NZD
Retailer 2
-
$63,918 NZD
View
Price last confirmed 14 days ago
B+
Retailer 3
-
$68,534 NZD
View
Retailer 4
-
$70,624 NZD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$70,889 NZD
View
B+
Retailer 6
-
$71,042 NZD
View
B+
Retailer 7
-
$71,042 NZD
View
Retailer 8
-
$73,568 NZD
View
Price last confirmed 15 days ago
B+
Retailer 9
-
$73,885 NZD
View
B+
Retailer 10
-
$74,097 NZD
View
Retailer 11
-
$76,510 NZD
View
Price last confirmed 15 days ago
Retailer 12
-
$76,651 NZD
View
Price last confirmed 11 days ago
B+
Retailer 13
-
$76,726 NZD
View
B+
Retailer 14
-
$76,946 NZD
View
Most Expensive
Aurelinne
ef843a20-8ae8-4ab8-b564-142ec00080e9 · Oct 23
$79,453 NZD
$44,664 USD
View
Price last confirmed 14 days ago
14 more retailers have this diamond
Prices start from $61,749 NZDSave up to $15,197 NZD

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
$61,749 NZD