Round|Natural|GIA

4.25ct K SI1 Round Natural Diamond

EX • K/SI1

Diamond specifications and retailer prices

From £25,791 GBP
As of November 4, 2026
Save £6,347 GBP (20%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £33,185 GBP 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 4, 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 4
Current: £32,046 GBP|Low: £25,791 GBP|High: £33,247 GBP|Avg: £30,913 GBP|-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£25,791 GBP
Retailer 8£28,624 GBP
Retailer 10£29,497 GBP
Retailer 4£29,608 GBP
Retailer 2£29,672 GBP
Retailer 3£29,672 GBP
Retailer 6£30,859 GBP
Retailer 7£30,948 GBP
Aurelinne£32,046 GBP
Retailer 9£32,138 GBP

19 data points across 10 retailers

15 retailers£25,791 GBP to £32,138 GBP

A
Cheapest Retailer
-
£25,791 GBP
Retailer 2
-
£26,696 GBP
View
Price last confirmed 14 days ago
B+
Retailer 3
-
£28,624 GBP
View
Retailer 4
-
£29,497 GBP
View
Price last confirmed 8 days ago
B+
Retailer 5
-
£29,608 GBP
View
B+
Retailer 6
-
£29,672 GBP
View
B+
Retailer 7
-
£29,672 GBP
View
Retailer 8
-
£30,727 GBP
View
Price last confirmed 15 days ago
B+
Retailer 9
-
£30,859 GBP
View
B+
Retailer 10
-
£30,948 GBP
View
Retailer 11
-
£31,956 GBP
View
Price last confirmed 15 days ago
Retailer 12
-
£32,015 GBP
View
Price last confirmed 11 days ago
B+
Retailer 13
-
£32,046 GBP
View
B+
Retailer 14
-
£32,138 GBP
View
Most Expensive
Aurelinne
ef843a20-8ae8-4ab8-b564-142ec00080e9 · Oct 23
£33,185 GBP
$44,664 USD
View
Price last confirmed 14 days ago
14 more retailers have this diamond
Prices start from £25,791 GBPSave up to £6,347 GBP

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
£25,791 GBP