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Round|Natural|GIA

3.21ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6555441578

Certificate GIA 6555441578

Diamond specifications and retailer prices

From £25,492 GBP
CA$47,439 CAD
As of October 30, 2026
Save £16,518 GBP (39%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £42,010 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 3.21ct natural round diamond

This 3.21ct 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 GIA 6555441578. Listed at 12 retailers as of October 29, 2026, with prices from £25,492 to £42,010, a £16,518 spread on the same certified stone. MOH London lists it at £42,010. 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

3.21
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6555441578
Dimensions9.43 × 9.37 × 5.87 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
9.43 mm9.37 mm3.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555441578
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £42,010 GBP|Low: £22,368 GBP|High: £42,290 GBP|Avg: £28,596 GBP|-0.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 31, 2026
Retailer 5£22,494 GBP
Retailer 6£23,619 GBP
Retailer 10£25,492 GBP
Retailer 3£25,651 GBP
Retailer 14£26,816 GBP
Retailer 2£27,014 GBP
Retailer 4£28,181 GBP
Retailer 8£28,181 GBP
Retailer 11£28,341 GBP
Retailer 9£29,122 GBP
Retailer 12£31,612 GBP
Retailer 7£31,825 GBP
Retailer 13£31,895 GBP
MOH London£42,010 GBP

28 data points across 14 retailers

12 retailers£25,492 GBP to £42,010 GBP

B+
Cheapest Retailer
-
£25,492 GBP
CA$47,439 CAD
B+
Retailer 2
-
£25,651 GBP
$34,369 USD
View
B+
Retailer 3
-
£26,816 GBP
$35,930 USD
View
B+
Retailer 4
-
£27,014 GBP
View
B+
Retailer 5
-
£28,181 GBP
$37,760 USD
View
B+
Retailer 6
-
£28,181 GBP
$37,760 USD
View
B+
Retailer 7
-
£28,341 GBP
$37,974 USD
View
B
Retailer 8
-
£29,122 GBP
$39,020 USD
View
B
Retailer 9
-
£31,612 GBP
$42,356 USD
View
B+
Retailer 10
-
£31,825 GBP
€40,612 EUR
View
B
Retailer 11
-
£31,895 GBP
$42,736 USD
View
Most Expensive
B
MOH London
059A526E6 · Oct 29
£42,010 GBP
View
11 more retailers have this diamond
Prices start from £25,492 GBPSave up to £16,518 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.

B+
3.21ct Round
£25,492 GBP