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5.09ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 586341414

Shape and cutting style on the report: Round brilliant

Certificate IGI 586341414

Diamond specifications and retailer prices

From £45,656 GBP
$61,174 USD
As of October 30, 2026
Save £33,448 GBP (42%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £79,104 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 5.09ct natural round diamond

This 5.09ct 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 586341414. Listed at 10 retailers as of October 29, 2026, with prices from £45,656 to £79,104, a £33,448 spread on the same certified stone. MOH London lists it at £79,104. 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

5.09
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 586341414
Dimensions11.15 × 11.11 × 6.71 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
11.15 mm11.11 mm5.09 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 586341414
Side View
Table 59.0%Crown 34.1°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.3%

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 30
Current: £79,104 GBP|Low: £43,638 GBP|High: £79,631 GBP|Avg: £55,392 GBP|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 29, 2026
Retailer 3£43,638 GBP
Retailer 9£44,865 GBP
Retailer 4£45,656 GBP
Retailer 8£50,380 GBP
Retailer 6£54,579 GBP
Retailer 7£56,678 GBP
Retailer 2£59,476 GBP
Retailer 5£64,738 GBP
MOH London£79,104 GBP

27 data points across 9 retailers

10 retailers£45,656 GBP to £79,104 GBP

Retailer 1
-
£43,638 GBP
$58,470 USD
Price last confirmed 13 days ago
A
Retailer 2
-
£45,656 GBP
$61,174 USD
View
A
Retailer 3
-
£50,380 GBP
$67,504 USD
View
B+
Retailer 4
-
£52,480 GBP
$70,317 USD
View
B+
Retailer 5
-
£52,480 GBP
$70,317 USD
View
B+
Retailer 6
-
£54,579 GBP
$73,130 USD
View
B+
Retailer 7
-
£56,678 GBP
$75,942 USD
View
B+
Retailer 8
-
£59,476 GBP
€75,897 EUR
View
Retailer 9
-
£64,738 GBP
View
Price last confirmed 31 days ago
Most Expensive
B
MOH London
43D554DD0 · Oct 29
£79,104 GBP
View
9 more retailers have this diamond
Prices start from £45,656 GBPSave up to £33,448 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
5.09ct Round
£45,656 GBP