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Round|Lab Grown|IGI

1.09ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG775620770

Shape and cutting style on the report: Round brilliant

Certificate IGI LG775620770

Diamond specifications and retailer prices

From £107 GBP
$143 USD
As of October 26, 2026
Save £514 GBP (83%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £621 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG775620770 or 775620770. Listed at 18 retailers as of October 26, 2026, with prices from £107 to £621, a £514 spread on the same certified stone. MOH London lists it at £621. 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

1.09
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG775620770
Dimensions6.59 × 6.64 × 4.05 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.59 mm6.64 mm1.09 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG775620770
Side View
Table 57.0%Crown 33.7°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 61.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: £621 GBP|Low: £119 GBP|High: £663 GBP|Avg: £314 GBP|-5.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 28, 2026
Retailer 14£119 GBP
Retailer 13£124 GBP
Retailer 11£153 GBP
Retailer 10£226 GBP
Retailer 9£226 GBP
Retailer 12£240 GBP
Retailer 3£247 GBP
Retailer 5£277 GBP
Retailer 4£318 GBP
Retailer 6£321 GBP
Retailer 15£334 GBP
Retailer 7£348 GBP
Retailer 8£362 GBP
Retailer 2£463 GBP
MOH London£621 GBP

42 data points across 15 retailers

18 retailers£107 GBP to £621 GBP

A
Cheapest Retailer
-
£107 GBP
$143 USD
A
Retailer 2
-
£119 GBP
$160 USD
View
Final sale: no returns
A
Retailer 3
-
£124 GBP
$166 USD
View
Retailer 4
-
£133 GBP
$178 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
£153 GBP
HK$1,600 HKD
View
A
Retailer 6
-
£226 GBP
View
A
Retailer 7
-
£226 GBP
€289 EUR
View
A
Retailer 8
-
£240 GBP
$321 USD
View
B+
Retailer 9
-
£247 GBP
$331 USD
View
Retailer 10
-
£277 GBP
View
Price last confirmed 14 days ago
B+
Retailer 11
-
£318 GBP
$426 USD
View
Retailer 12
-
£321 GBP
$430 USD
View
Price last confirmed 23 days ago
B+
Retailer 13
-
£334 GBP
$448 USD
View
B+
Retailer 14
-
£348 GBP
A$718 AUD
View
B+
Retailer 15
-
£362 GBP
SGD 655 SGD
View
B+
Retailer 16
-
£426 GBP
$571 USD
View
B
Retailer 17
-
£463 GBP
$620 USD
View
Most Expensive
B
MOH London
LG775620770 · Oct 26
£621 GBP
View
17 more retailers have this diamond
Prices start from £107 GBPSave up to £514 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
1.09ct Round
£107 GBP