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Cushion|Lab Grown|IGI

1.38ct D IF Cushion Lab Grown Diamond

D/IF • IGI LG783670536

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG783670536

Diamond specifications and retailer prices

From £301 GBP
$403 USD
As of October 31, 2026
Save £1,475 GBP (83%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,776 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.38ct lab-grown cushion diamond

This 1.38ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless) and certified by IGI LG783670536 or 783670536. Listed at 19 retailers as of October 31, 2026, with prices from £301 to £1,776, a £1,475 spread on the same certified stone. Brilliant Earth lists it at £1,776. 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

1.38
Carat
D
Colour
IF
Clarity
-
Cut

Specifications

Cut
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG783670536
Dimensions6.55 × 6.37 × 4.30 mm
L/W Ratio1.03
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
6.55 mm6.37 mm1.38 ctD / IF
OriginLab Grown
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG783670536
Side View
Table 63.0%Crown 35°Girdle: MED-THKPavilion 40.3°Culet: NoneDepth 67.5%

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 31
Current: £1,776 GBP|Low: £295 GBP|High: £1,978 GBP|Avg: £817 GBP|-10.2%
Brilliant Earth
Retailer 2
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Retailer 12
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Retailer 19
November 1, 2026
Retailer 13£301 GBP
Retailer 11£327 GBP
Retailer 4£345 GBP
Retailer 14£448 GBP
Retailer 12£525 GBP
Retailer 19£535 GBP
Retailer 8£561 GBP
Retailer 18£576 GBP
Retailer 2£598 GBP
Retailer 17£752 GBP
Retailer 7£793 GBP
Retailer 15£853 GBP
Retailer 5£1,105 GBP
Retailer 3£1,275 GBP
Retailer 10£1,283 GBP
Retailer 6£1,297 GBP
Retailer 9£1,317 GBP
Retailer 16£1,489 GBP
Brilliant Earth£1,776 GBP

23 data points across 19 retailers

19 retailers£301 GBP to £1,776 GBP

A
Cheapest Retailer
-
£301 GBP
$403 USD
Final sale: no returns
A
Retailer 2
-
£327 GBP
$438 USD
View
A
Retailer 3
-
£345 GBP
View
A
Retailer 4
-
£448 GBP
$600 USD
View
A
Retailer 5
-
£525 GBP
€670 EUR
View
A
Retailer 6
-
£535 GBP
$717 USD
View
A
Retailer 7
-
£561 GBP
ZAR 12,149 ZAR
View
A
Retailer 8
-
£576 GBP
$772 USD
View
A
Retailer 9
-
£598 GBP
View
B+
Retailer 10
-
£752 GBP
$1,008 USD
View
B+
Retailer 11
-
£793 GBP
A$1,635 AUD
View
B+
Retailer 12
-
£853 GBP
$1,143 USD
View
B+
Retailer 13
-
£1,105 GBP
$1,480 USD
View
B
Retailer 14
-
£1,275 GBP
$1,708 USD
View
Retailer 15
-
£1,283 GBP
View
Price last confirmed 12 days ago
B
Retailer 16
-
£1,297 GBP
View
Retailer 17
-
£1,317 GBP
$1,765 USD
View
Price last confirmed 13 days ago
B
Retailer 18
-
£1,489 GBP
A$3,069 AUD
View
Most Expensive
B
Brilliant Earth
18445978A · Oct 31
£1,776 GBP
$2,380 USD
View
18 more retailers have this diamond
Prices start from £301 GBPSave up to £1,475 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
1.38ct Cushion
£301 GBP