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Round|Natural|IGI

3.50ct I SI1 Round Natural Diamond

EX • I/SI1 • IGI 801638603

Shape and cutting style on the report: Round brilliant

Certificate IGI 801638603

Diamond specifications and retailer prices

From £17,265 GBP
₹2,203,105 INR
As of October 31, 2026
Save £13,235 GBP (43%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £30,500 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 3.5ct natural round diamond

This 3.5ct natural round sits in the three to five carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 801638603. Listed at 11 retailers as of October 31, 2026, with prices from £17,265 to £30,500, a £13,235 spread on the same certified stone. MOH London lists it at £30,500. 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

3.50
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.2°
Pavilion angle40.9°
OriginNatural
Grading LabIGI
CertificateIGI 801638603
Dimensions9.57 × 9.64 × 6.05 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
9.57 mm9.64 mm3.50 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 801638603
Side View
Table 58.0%Crown 36.2°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 62.9%

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 31
Current: £30,500 GBP|Low: £17,220 GBP|High: £30,867 GBP|Avg: £21,877 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 6£17,265 GBP
Retailer 4£18,998 GBP
Retailer 10£19,364 GBP
Retailer 9£19,626 GBP
Retailer 3£20,010 GBP
Retailer 7£21,556 GBP
Retailer 2£23,324 GBP
Retailer 8£23,541 GBP
Retailer 5£25,317 GBP
MOH London£30,500 GBP

41 data points across 10 retailers

11 retailers£17,265 GBP to £30,500 GBP

A
Cheapest Retailer
-
£17,265 GBP
₹2,203,105 INR
A
Retailer 2
-
£18,998 GBP
$25,455 USD
View
A
Retailer 3
-
£19,364 GBP
$25,946 USD
View
A
Retailer 4
-
£19,626 GBP
$26,297 USD
View
A
Retailer 5
-
£20,010 GBP
View
A
Retailer 6
-
£21,556 GBP
$28,883 USD
View
A
Retailer 7
-
£23,324 GBP
€29,764 EUR
View
B+
Retailer 8
-
£23,541 GBP
$31,542 USD
View
B+
Retailer 9
-
£23,989 GBP
$32,143 USD
View
B+
Retailer 10
-
£25,317 GBP
ZAR 548,003 ZAR
View
Most Expensive
B
MOH London
52B90A9A0 · Nov 1
£30,500 GBP
View
10 more retailers have this diamond
Prices start from £17,265 GBPSave up to £13,235 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
3.50ct Round
£17,265 GBP