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Round|Natural|GIA

6.18ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5234208640

Certificate GIA 5234208640

Diamond specifications and retailer prices

From £53,923 GBP
As of November 4, 2026
Save £17,072 GBP (24%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £70,995 GBP at Yorxs · As of November 5, 2026
View at Yorxs

About this 6.18ct natural round diamond

This 6.18ct 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 5234208640. Listed at 10 retailers as of November 4, 2026, with prices from £53,923 to £70,995, a £17,072 spread on the same certified stone. Yorxs lists it at £70,995. 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

6.18
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5234208640
Dimensions11.66 × 11.60 × 7.28 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
11.66 mm11.60 mm6.18 ctK / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 5234208640
Side View
Table 58.0%Crown 35.5°Girdle: STK-STKPavilion 41°Culet: NoneDepth 62.6%

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: Nov 4
Current: £58,279 GBP|Low: £52,095 GBP|High: £71,376 GBP|Avg: £60,753 GBP|-3.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Yorxs
November 6, 2026
Retailer 6£52,095 GBP
Retailer 2£54,117 GBP
Retailer 1£58,279 GBP
Retailer 4£61,447 GBP
Retailer 3£64,005 GBP
Retailer 5£64,020 GBP
Yorxs£70,995 GBP

40 data points across 7 retailers

10 retailers£53,923 GBP to £70,995 GBP

Retailer 1
-
£52,095 GBP
Price last confirmed 19 days ago
B+
Retailer 2
-
£53,923 GBP
View
A
Retailer 3
-
£54,117 GBP
View
B+
Retailer 4
-
£54,431 GBP
View
B+
Retailer 5
-
£57,936 GBP
View
B+
Retailer 6
-
£58,279 GBP
View
B+
Retailer 7
-
£61,447 GBP
View
B+
Retailer 8
-
£64,005 GBP
View
B
Retailer 9
-
£64,020 GBP
View
Most Expensive
B
Yorxs
GYMY191 · Nov 5
£70,995 GBP
€91,003 EUR
View
9 more retailers have this diamond
Prices start from £53,923 GBPSave up to £17,072 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
6.18ct Round
£53,923 GBP