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Round|Natural|GIA

5.50ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6505424045

Certificate GIA 6505424045

Diamond specifications and retailer prices

From £50,508 GBP
As of November 6, 2026
Save £17,613 GBP (26%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £68,122 GBP at Yorxs · As of November 5, 2026
View at Yorxs

About this 5.5ct natural round diamond

This 5.5ct 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 6505424045. Listed at 8 retailers as of November 5, 2026, with prices from £50,508 to £68,122, a £17,613 spread on the same certified stone. Yorxs lists it at £68,122. 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

5.50
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle32°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6505424045
Dimensions11.39 × 11.46 × 6.81 mm
L/W Ratio1.01
Star length45%
Lower girdle75%
Top View
11.39 mm11.46 mm5.50 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6505424045
Side View
Table 59.0%Crown 32°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 59.6%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: £62,161 GBP|Low: £49,979 GBP|High: £68,900 GBP|Avg: £60,417 GBP|+0.8%
Retailer 1
Retailer 2
Yorxs
November 6, 2026
Retailer 2£50,508 GBP
Retailer 1£62,161 GBP
Yorxs£68,122 GBP

40 data points across 3 retailers

8 retailers£50,508 GBP to £68,122 GBP

B+
Cheapest Retailer
-
£50,508 GBP
B+
Retailer 2
-
£52,409 GBP
View
B+
Retailer 3
-
£52,673 GBP
View
B+
Retailer 4
-
£55,222 GBP
View
B
Retailer 5
-
£61,358 GBP
View
B
Retailer 6
-
£62,161 GBP
View
B
Retailer 7
-
£64,897 GBP
View
Most Expensive
B
Yorxs
57512 · Nov 5
£68,122 GBP
€87,320 EUR
View
7 more retailers have this diamond
Prices start from £50,508 GBPSave up to £17,613 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+
5.50ct Round
£50,508 GBP