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Cushion|Lab Grown|IGI

1.30ct D SI1 Cushion Lab Grown Diamond

GD • D/SI1 • IGI LG570350845

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG570350845

Diamond specifications and retailer prices

From £352 GBP
$471 USD
As of October 30, 2026
Save £1,085 GBP (76%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,437 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.3ct lab-grown cushion diamond

This 1.3ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG570350845 or 570350845. Listed at 8 retailers as of October 29, 2026, with prices from £352 to £1,437, a £1,085 spread on the same certified stone. MOH London lists it at £1,437. 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

1.30
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.8°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG570350845
Dimensions6.27 × 6.25 × 4.27 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
6.27 mm6.25 mm1.30 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG570350845
Side View
Table 60.5%Crown 37.8°Girdle: MED-THKPavilion 39.5°Culet: NoneDepth 68.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £1,437 GBP|Low: £251 GBP|High: £1,446 GBP|Avg: £639 GBP|-0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 31, 2026
Retailer 7£352 GBP
Retailer 8£435 GBP
Retailer 4£437 GBP
Retailer 2£594 GBP
Retailer 6£613 GBP
Retailer 3£636 GBP
Retailer 5£743 GBP
MOH London£1,437 GBP

41 data points across 8 retailers

8 retailers£352 GBP to £1,437 GBP

B+
Cheapest Retailer
-
£352 GBP
$471 USD
Final sale: no returns
B+
Retailer 2
-
£435 GBP
$583 USD
View
B+
Retailer 3
-
£437 GBP
$585 USD
View
B
Retailer 4
-
£594 GBP
€758 EUR
View
B
Retailer 5
-
£613 GBP
$822 USD
View
B
Retailer 6
-
£636 GBP
View
B
Retailer 7
-
£743 GBP
$995 USD
View
Most Expensive
B
MOH London
LG570350845 · Oct 29
£1,437 GBP
View
7 more retailers have this diamond
Prices start from £352 GBPSave up to £1,085 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+
1.30ct Cushion
£352 GBP