CaratHunter
Plans
Round|Natural|IGI

5.31ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 667406502

Shape and cutting style on the report: Round brilliant

Certificate IGI 667406502

Diamond specifications and retailer prices

From $63,742 AUD
$44,775 USD
As of October 29, 2026
Save $36,566 AUD (36%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $100,308 AUD at MOH London · As of October 29, 2026
View at MOH London

About this 5.31ct natural round diamond

This 5.31ct 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 IGI 667406502. Listed at 12 retailers as of October 29, 2026, with prices from $63,742 to $100,308, a $36,566 spread on the same certified stone. MOH London lists it at $100,308. 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

5.31
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 667406502
Dimensions11.21 × 11.14 × 6.89 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
11.21 mm11.14 mm5.31 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 667406502
Side View
Table 60.0%Crown 35.3°Girdle: MediumPavilion 41.1°Culet: NoneDepth 61.7%

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: Oct 29
Current: $100,308 AUD|Low: $58,763 AUD|High: $100,975 AUD|Avg: $74,280 AUD|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9$63,742 AUD
Retailer 12$63,907 AUD
Retailer 6$64,640 AUD
Retailer 8$66,546 AUD
Retailer 3$70,517 AUD
Retailer 7$73,455 AUD
Retailer 10$76,393 AUD
Retailer 2$77,717 AUD
Retailer 4$78,543 AUD
Retailer 11$79,332 AUD
Retailer 5$81,579 AUD
MOH London$100,308 AUD

31 data points across 12 retailers

12 retailers$63,742 AUD to $100,308 AUD

A
Cheapest Retailer
-
$63,742 AUD
$44,775 USD
A
Retailer 2
-
$63,907 AUD
$44,891 USD
View
A
Retailer 3
-
$64,640 AUD
$45,406 USD
View
Final sale: no returns
Retailer 4
-
$66,546 AUD
$46,745 USD
View
Price last confirmed 64 days ago
Retailer 5
-
$66,546 AUD
$46,745 USD
View
Price last confirmed 12 days ago
A
Retailer 6
-
$73,455 AUD
$51,598 USD
View
A
Retailer 7
-
$76,393 AUD
$53,662 USD
View
A
Retailer 8
-
$77,717 AUD
€51,992 EUR
View
Retailer 9
-
$78,543 AUD
$55,172 USD
View
Price last confirmed 14 days ago
Retailer 10
-
$79,332 AUD
$55,726 USD
View
Price last confirmed 9 days ago
A
Retailer 11
-
$81,579 AUD
£45,122 GBP
View
Most Expensive
B+
MOH London
079A733F5 · Oct 29
$100,308 AUD
£55,481 GBP
View
11 more retailers have this diamond
Prices start from $63,742 AUDSave up to $36,566 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
5.31ct Round
$63,742 AUD