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Round|Lab Grown|IGI

1.00ct G SI1 Round Lab Grown Diamond

FR • G/SI1 • IGI LG811646377

Shape and cutting style on the report: Round brilliant

Certificate IGI LG811646377

Diamond specifications and retailer prices

From £112 GBP
$150 USD
As of October 29, 2026
Save £539 GBP (83%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £651 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 1ct lab-grown round diamond

This 1ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG811646377 or 811646377. Listed at 10 retailers as of October 26, 2026, with prices from £112 to £651, a £539 spread on the same certified stone. MOH London lists it at £651. 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

1.00
Carat
G
Colour
SI1
Clarity
Fair
Cut

Specifications

CutFair
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle34.4°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811646377
Dimensions6.43 × 6.36 × 3.76 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
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
6.43 mm6.36 mm1.00 ctG / SI1
OriginLab Grown
CutFair
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG811646377
Side View
Table 60.0%Crown 34.4°Girdle: STK-THKPavilion 38.5°Culet: NoneDepth 58.7%

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: £651 GBP|Low: £107 GBP|High: £658 GBP|Avg: £322 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 4£112 GBP
Retailer 8£130 GBP
Retailer 5£139 GBP
Retailer 6£255 GBP
Retailer 2£311 GBP
Retailer 7£377 GBP
Retailer 9£422 GBP
Retailer 3£472 GBP
MOH London£651 GBP

39 data points across 9 retailers

10 retailers£112 GBP to £651 GBP

B+
Cheapest Retailer
-
£112 GBP
$150 USD
B+
Retailer 2
-
£130 GBP
$174 USD
View
B+
Retailer 3
-
£139 GBP
$186 USD
View
B+
Retailer 4
-
£139 GBP
$186 USD
View
B
Retailer 5
-
£255 GBP
$342 USD
View
B
Retailer 6
-
£311 GBP
View
B
Retailer 7
-
£377 GBP
$505 USD
View
C
Retailer 8
-
£447 GBP
$599 USD
View
C
Retailer 9
-
£472 GBP
$633 USD
View
Most Expensive
C
MOH London
LG811646377 · Oct 26
£651 GBP
View
9 more retailers have this diamond
Prices start from £112 GBPSave up to £539 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+
1.00ct Round
£112 GBP