CaratHunter
Plans
Round|Natural|GIA

4.25ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6541127304

Certificate GIA 6541127304

Diamond specifications and retailer prices

From £25,934 GBP
As of October 31, 2026
Save £18,553 GBP (42%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £44,487 GBP at MOH London · As of November 2, 2026
View at MOH London

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 6541127304. Listed at 23 retailers as of October 31, 2026, with prices from £25,934 to £44,487, a £18,553 spread on the same certified stone. MOH London lists it at £44,487. 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
Crown angle33°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 6541127304
Dimensions10.40 × 10.31 × 6.40 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
10.40 mm10.31 mm4.25 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6541127304
Side View
Table 60.0%Crown 33°Girdle: Slightly ThickPavilion 41.8°Culet: NoneDepth 61.9%

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: Oct 31
Current: £44,487 GBP|Low: £25,934 GBP|High: £46,623 GBP|Avg: £32,944 GBP|-4.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 5, 2026
Retailer 14£25,934 GBP
Retailer 13£25,995 GBP
Retailer 3£26,068 GBP
Retailer 2£26,555 GBP
Retailer 11£26,855 GBP
Retailer 4£27,586 GBP
Retailer 9£28,046 GBP
Retailer 8£28,246 GBP
Retailer 5£29,411 GBP
Retailer 10£30,462 GBP
Retailer 6£34,047 GBP
Retailer 7£34,370 GBP
Retailer 12£35,696 GBP
MOH London£44,487 GBP

36 data points across 14 retailers

23 retailers£25,934 GBP to £44,487 GBP

A
Cheapest Retailer
-
£25,934 GBP
A
Retailer 2
-
£25,995 GBP
View
A
Retailer 3
-
£26,068 GBP
View
A
Retailer 4
-
£26,555 GBP
View
A
Retailer 5
-
£26,855 GBP
View
A
Retailer 6
-
£27,586 GBP
View
B+
Retailer 7
-
£28,046 GBP
View
A
Retailer 8
-
£28,246 GBP
View
B+
Retailer 9
-
£29,411 GBP
View
Retailer 10
-
£29,497 GBP
View
Price last confirmed 21 days ago
B+
Retailer 11
-
£30,462 GBP
View
Retailer 12
-
£30,727 GBP
View
Price last confirmed 48 days ago
Retailer 13
-
£30,727 GBP
View
Price last confirmed 20 days ago
Retailer 14
-
£30,727 GBP
View
Price last confirmed 22 days ago
Retailer 15
-
£31,956 GBP
View
Price last confirmed 45 days ago
Retailer 16
-
£31,956 GBP
View
Price last confirmed 19 days ago
Retailer 17
-
£33,021 GBP
View
Price last confirmed 14 days ago
Retailer 18
-
£33,185 GBP
View
Price last confirmed 45 days ago
Retailer 19
-
£33,185 GBP
View
Price last confirmed 19 days ago
Retailer 20
-
£34,047 GBP
View
Price last confirmed 10 days ago
B+
Retailer 21
-
£34,370 GBP
View
B
Retailer 22
-
£35,696 GBP
View
Most Expensive
B
MOH London
5243C3FC5 · Nov 2
£44,487 GBP
View
22 more retailers have this diamond
Prices start from £25,934 GBPSave up to £18,553 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
£25,934 GBP