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0.31ct J I1 Round Natural Diamond

EX • J/I1 • IGI 320851903

Shape and cutting style on the report: Round brilliant

Certificate IGI 320851903

Diamond specifications and retailer prices

From £128 GBP
$172 USD
As of October 31, 2026
Save £452 GBP (78%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £580 GBP at NZ Jewellers · As of November 2, 2026
View at NZ Jewellers

About this 0.31ct natural round diamond

This 0.31ct natural round sits in the sub-half-carat band, graded J colour (near-colourless) and I1 clarity (included), with a top-tier cut grade and certified by IGI 320851903. Listed at 8 retailers as of October 31, 2026, with prices from £128 to £580, a £452 spread on the same certified stone. NZ Jewellers lists it at £580. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

0.31
Carat
J
Colour
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle40.4°
OriginNatural
Grading LabIGI
CertificateIGI 320851903
Dimensions4.39 × 4.43 × 2.59 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
4.39 mm4.43 mm0.31 ctJ / I1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI 320851903
Side View
Table 62.5%Crown 34.3°Girdle: UNDPavilion 40.4°Culet: NoneDepth 58.8%

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 31
Current: £231 GBP|Low: £124 GBP|High: £233 GBP|Avg: £178 GBP|+3.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
November 1, 2026
Retailer 2£125 GBP
Retailer 3£163 GBP
Retailer 4£195 GBP
Retailer 1£231 GBP

18 data points across 4 retailers

8 retailers£128 GBP to £580 GBP

B+
Cheapest Retailer
-
£128 GBP
$172 USD
B+
Retailer 2
-
£138 GBP
$185 USD
View
B+
Retailer 3
-
£143 GBP
$192 USD
View
B+
Retailer 4
-
£158 GBP
$212 USD
View
Price last confirmed 7 days ago
B+
Retailer 5
-
£163 GBP
$218 USD
View
B+
Retailer 6
-
£172 GBP
$231 USD
View
B
Retailer 7
-
£231 GBP
€295 EUR
View
Most Expensive
C
NZ Jewellers
6201fe03-5bad-4a38-991d-5938059b446a · Nov 2
£580 GBP
$778 USD
View
7 more retailers have this diamond
Prices start from £128 GBPSave up to £452 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+
0.31ct Round
£128 GBP