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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 $103,629 AUD
As of November 6, 2026
Save $32,869 AUD (24%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $136,498 AUD 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 5, 2026, with prices from $103,629 to $136,498, a $32,869 spread on the same certified stone. Yorxs lists it at $136,498. 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 6
Current: $103,629 AUD|Low: $100,159 AUD|High: $137,230 AUD|Avg: $116,808 AUD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Yorxs
November 6, 2026
Retailer 6$100,159 AUD
Retailer 1$103,629 AUD
Retailer 2$112,050 AUD
Retailer 4$118,140 AUD
Retailer 3$123,058 AUD
Retailer 5$123,087 AUD
Yorxs$136,498 AUD

40 data points across 7 retailers

10 retailers$103,629 AUD to $136,498 AUD

Retailer 1
-
$100,159 AUD
Price last confirmed 19 days ago
A
Retailer 2
-
$103,629 AUD
View
B+
Retailer 3
-
$103,675 AUD
View
B+
Retailer 4
-
$104,652 AUD
View
B+
Retailer 5
-
$111,390 AUD
View
B+
Retailer 6
-
$112,050 AUD
View
B+
Retailer 7
-
$118,140 AUD
View
B+
Retailer 8
-
$123,058 AUD
View
B
Retailer 9
-
$123,087 AUD
View
Most Expensive
B
Yorxs
GYMY191 · Nov 5
$136,498 AUD
€91,003 EUR
View
9 more retailers have this diamond
Prices start from $103,629 AUDSave up to $32,869 AUD

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
$103,629 AUD