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Round|Natural|GIA

5.21ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2135168818

Certificate GIA 2135168818

Diamond specifications and retailer prices

From £42,084 GBP
As of November 6, 2026
Save £26,152 GBP (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £68,235 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 5.21ct natural round diamond

This 5.21ct natural round sits in the over five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2135168818. Listed at 9 retailers as of November 4, 2026, with prices from £42,084 to £68,235, a £26,152 spread on the same certified stone. MOH London lists it at £68,235. 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

5.21
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2135168818
Dimensions11.05 × 11.08 × 6.86 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Top View
11.05 mm11.08 mm5.21 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2135168818
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.0%

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: £68,235 GBP|Low: £42,084 GBP|High: £69,243 GBP|Avg: £49,285 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8£42,084 GBP
Retailer 4£42,921 GBP
Retailer 2£43,854 GBP
Retailer 5£46,499 GBP
Retailer 6£46,499 GBP
Retailer 7£49,181 GBP
Retailer 3£51,572 GBP
MOH London£68,235 GBP

36 data points across 8 retailers

9 retailers£42,084 GBP to £68,235 GBP

A
Cheapest Retailer
-
£42,084 GBP
A
Retailer 2
-
£42,921 GBP
View
A
Retailer 3
-
£43,854 GBP
View
Retailer 4
-
£45,634 GBP
View
Price last confirmed 48 days ago
B+
Retailer 5
-
£46,499 GBP
View
B+
Retailer 6
-
£46,499 GBP
View
B+
Retailer 7
-
£49,181 GBP
View
B+
Retailer 8
-
£51,572 GBP
View
Most Expensive
B
MOH London
AAE49B0FC · Nov 4
£68,235 GBP
View
8 more retailers have this diamond
Prices start from £42,084 GBPSave up to £26,152 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
5.21ct Round
£42,084 GBP