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Marquise|Natural|IGI

0.31ct I SI1 Marquise Natural Diamond

VG • I/SI1 • IGI 839657974

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 839657974

Diamond specifications and retailer prices

From £206 GBP
$277 USD
As of October 29, 2026
Save £273 GBP (57%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £480 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 839657974. Listed at 8 retailers as of October 29, 2026, with prices from £206 to £480, a £273 spread on the same certified stone. MOH London lists it at £480. 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
SymmetryVery Good
FluorescenceNone
Crown angle30.6°
Pavilion angle40.3°
OriginNatural
Grading LabIGI
CertificateIGI 839657974
Dimensions7.39 × 3.33 × 2.17 mm
L/W Ratio2.22
Girdle conditionFaceted
Top View
7.39 mm3.33 mm0.31 ctI / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 839657974
Side View
Table 52.0%Crown 30.6°Girdle: STK-THKPavilion 40.3°Culet: NoneDepth 65.2%

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: £480 GBP|Low: £206 GBP|High: £937 GBP|Avg: £411 GBP|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4£206 GBP
Retailer 8£231 GBP
Retailer 5£288 GBP
Retailer 7£322 GBP
Retailer 2£359 GBP
Retailer 3£420 GBP
MOH London£480 GBP
Retailer 6£937 GBP

13 data points across 8 retailers

8 retailers£206 GBP to £480 GBP

B+
Cheapest Retailer
-
£206 GBP
$277 USD
B+
Retailer 2
-
£231 GBP
$310 USD
View
B
Retailer 3
-
£288 GBP
$386 USD
View
B
Retailer 4
-
£322 GBP
$432 USD
View
B
Retailer 5
-
£359 GBP
€459 EUR
View
C
Retailer 6
-
£420 GBP
View
Most Expensive
C
MOH London
9C1C28148 · Oct 29
£480 GBP
View
6 more retailers have this diamond
Prices start from £206 GBPSave up to £273 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
£206 GBP