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Round|Natural|GIA

4.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1232890642

Certificate GIA 1232890642

Diamond specifications and retailer prices

From £35,138 GBP
As of November 4, 2026
Save £25,255 GBP (42%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £60,393 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 4.51ct natural round diamond

This 4.51ct 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 1232890642. Listed at 12 retailers as of November 4, 2026, with prices from £35,138 to £60,393, a £25,255 spread on the same certified stone. MOH London lists it at £60,393. 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

4.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 1232890642
Dimensions10.60 × 10.64 × 6.52 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle, Natural
Top View
10.60 mm10.64 mm4.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1232890642
Side View
Table 60.0%Crown 34°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £60,393 GBP|Low: £35,138 GBP|High: £61,285 GBP|Avg: £44,084 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£35,138 GBP
Retailer 3£38,191 GBP
Retailer 5£40,389 GBP
Retailer 6£40,389 GBP
Retailer 8£42,005 GBP
Retailer 9£43,620 GBP
Retailer 4£46,740 GBP
Retailer 2£48,253 GBP
MOH London£60,393 GBP

42 data points across 9 retailers

12 retailers£35,138 GBP to £60,393 GBP

B+
Cheapest Retailer
-
£35,138 GBP
B
Retailer 2
-
£37,547 GBP
View
B+
Retailer 3
-
£38,191 GBP
View
Retailer 4
-
£38,774 GBP
View
Price last confirmed 8 days ago
Retailer 5
-
£39,097 GBP
View
Price last confirmed 9 days ago
B
Retailer 6
-
£40,389 GBP
View
B
Retailer 7
-
£40,389 GBP
View
B
Retailer 8
-
£42,005 GBP
View
B
Retailer 9
-
£43,620 GBP
View
B
Retailer 10
-
£46,740 GBP
View
B
Retailer 11
-
£48,253 GBP
View
Most Expensive
B
MOH London
57A3B7F92 · Nov 4
£60,393 GBP
View
11 more retailers have this diamond
Prices start from £35,138 GBPSave up to £25,255 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.

B+
4.51ct Round
£35,138 GBP