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0.31ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG459129380

Shape and cutting style on the report: Round brilliant

Certificate IGI LG459129380

Diamond specifications and retailer prices

From £157 GBP
$210 USD
As of October 30, 2026
Save £535 GBP (77%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £692 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.31ct lab-grown round diamond

This 0.31ct lab-grown round sits in the sub-half-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG459129380 or 459129380. Listed at 5 retailers as of October 29, 2026, with prices from £157 to £692, a £535 spread on the same certified stone. MOH London lists it at £692. 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

0.31
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle33.6°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG459129380
Dimensions4.38 × 4.36 × 2.65 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
4.38 mm4.36 mm0.31 ctG / SI1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG459129380
Side View
Table 58.0%Crown 33.6°Girdle: THN-MEDPavilion 40.9°Culet: NoneDepth 60.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £692 GBP|Low: £157 GBP|High: £697 GBP|Avg: £327 GBP|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 30, 2026
Retailer 2£157 GBP
Retailer 3£258 GBP
Retailer 5£266 GBP
Retailer 4£308 GBP
MOH London£692 GBP

42 data points across 5 retailers

5 retailers£157 GBP to £692 GBP

A
Cheapest Retailer
-
£157 GBP
$210 USD
B+
Retailer 2
-
£258 GBP
View
B
Retailer 3
-
£266 GBP
$357 USD
View
B
Retailer 4
-
£308 GBP
€393 EUR
View
Most Expensive
B
MOH London
LG459129380 · Oct 29
£692 GBP
View
4 more retailers have this diamond
Prices start from £157 GBPSave up to £535 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
0.31ct Round
£157 GBP