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Cushion|Lab Grown|IGI

1.39ct D SI1 Cushion Lab Grown Diamond

GD • D/SI1 • IGI LG683579698

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG683579698

Diamond specifications and retailer prices

From £327 GBP
As of October 30, 2026
Save £1,389 GBP (81%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,717 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 1.39ct lab-grown cushion diamond

This 1.39ct 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 LG683579698 or 683579698. Listed at 8 retailers as of October 30, 2026, with prices from £327 to £1,717, a £1,389 spread on the same certified stone. Do Amore Diamonds lists it at £1,717. 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

1.39
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle37.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG683579698
Dimensions6.66 × 6.42 × 4.20 mm
L/W Ratio1.04
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
6.66 mm6.42 mm1.39 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG683579698
Side View
Table 57.0%Crown 36.3°Girdle: MED-STKPavilion 37.6°Culet: NoneDepth 65.4%

Caratlytics Score

How it works →
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 30
Current: £1,717 GBP|Low: £326 GBP|High: £1,769 GBP|Avg: £665 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 3£327 GBP
Retailer 2£362 GBP
Retailer 8£362 GBP
Retailer 6£409 GBP
Retailer 7£439 GBP
Retailer 9£499 GBP
Retailer 5£672 GBP
Retailer 4£1,098 GBP
Do Amore Diamonds£1,717 GBP

33 data points across 9 retailers

8 retailers£327 GBP to £1,717 GBP

A
Cheapest Retailer
-
£327 GBP
B+
Retailer 2
-
£362 GBP
$485 USD
View
A
Retailer 3
-
£362 GBP
$485 USD
View
B+
Retailer 4
-
£409 GBP
$548 USD
View
B+
Retailer 5
-
£439 GBP
$588 USD
View
Retailer 6
-
£672 GBP
$900 USD
View
Price last confirmed 10 days ago
B
Retailer 7
-
£1,098 GBP
View
Most Expensive
C
Do Amore Diamonds
7-1681876 · Oct 31
£1,717 GBP
$2,300 USD
View
7 more retailers have this diamond
Prices start from £327 GBPSave up to £1,389 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
1.39ct Cushion
£327 GBP