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Round|Natural|GIA

5.18ct I SI2 Round Natural Diamond

EX • I/SI2

Diamond specifications and retailer prices

From $65,552 AUD
$45,940 USD
As of November 1, 2026
1 retailer carries this diamond
Only listing: $65,552 AUD at Rare Carat
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Rare Carat

About this 5.18ct natural round diamond

This 5.18ct natural round sits in the over five carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at a single retailer as of November 1, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

5.18
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryGood
FluorescenceStrong
OriginNatural
Grading LabGIA
Dimensions10.97 × 11.01 × 6.87 mm
L/W Ratio1.00
Top View
10.97 mm11.01 mm5.18 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryGood
FluorescenceStrong
CertificateGIA
Side View
Table 60.0%CrownGirdle: MediumPavilionCulet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 1
Current: $65,552 AUD|Low: $65,552 AUD|High: $140,431 AUD|Avg: $86,881 AUD|-0.2%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 18, 2026
Rare Carat$65,552 AUD
Retailer 5$69,905 AUD
Retailer 7$76,846 AUD
Retailer 4$78,468 AUD
Retailer 8$81,739 AUD
Retailer 10$82,866 AUD
Retailer 6$85,008 AUD
Retailer 11$86,180 AUD
Retailer 9$88,277 AUD
Retailer 2$100,747 AUD
Retailer 3$140,431 AUD

5 data points across 11 retailers

1 retailer

B+
Rare Carat
WS348754B · Nov 1
$65,552 AUD
$45,940 USD
View

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+
5.18ct Round
$65,552 AUD