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Marquise|Natural|IGI

0.31ct I SI1 Marquise Natural Diamond

VG • I/SI1 • IGI 839656774

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 839656774

Diamond specifications and retailer prices

From £183 GBP
$245 USD
As of October 29, 2026
Save £240 GBP (57%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £423 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.31ct natural marquise diamond

This 0.31ct natural marquise sits in the sub-half-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 839656774. Listed at 8 retailers as of October 29, 2026, with prices from £183 to £423, a £240 spread on the same certified stone. MOH London lists it at £423. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.31
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryGood
FluorescenceNone
Crown angle30.4°
Pavilion angle39.1°
OriginNatural
Grading LabIGI
CertificateIGI 839656774
Dimensions7.18 × 3.53 × 2.03 mm
L/W Ratio2.03
Girdle conditionFaceted
Top View
7.18 mm3.53 mm0.31 ctI / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateIGI 839656774
Side View
Table 65.0%Crown 30.4°Girdle: MED-THKPavilion 39.1°Culet: NoneDepth 57.5%

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 29
Current: £423 GBP|Low: £183 GBP|High: £826 GBP|Avg: £357 GBP|+0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4£183 GBP
Retailer 8£203 GBP
Retailer 5£251 GBP
Retailer 7£300 GBP
Retailer 2£323 GBP
Retailer 3£370 GBP
MOH London£423 GBP
Retailer 6£826 GBP

13 data points across 8 retailers

8 retailers£183 GBP to £423 GBP

B+
Cheapest Retailer
-
£183 GBP
$245 USD
B+
Retailer 2
-
£203 GBP
$273 USD
View
B
Retailer 3
-
£251 GBP
$337 USD
View
B
Retailer 4
-
£300 GBP
$403 USD
View
B
Retailer 5
-
£323 GBP
€413 EUR
View
B
Retailer 6
-
£370 GBP
View
Most Expensive
C
MOH London
5A3CC6575 · Oct 29
£423 GBP
View
6 more retailers have this diamond
Prices start from £183 GBPSave up to £240 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 Marquise
£183 GBP