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Cushion|Lab Grown|IGI

1.78ct D FL Cushion Lab Grown Diamond

GD • D/FL • IGI LG784642240

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

Certificate IGI LG784642240

Diamond specifications and retailer prices

From £601 GBP
$805 USD
As of October 31, 2026
Save £3,191 GBP (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,791 GBP at Yadav Diamonds · As of October 30, 2026
View at Yadav Diamonds

About this 1.78ct lab-grown cushion diamond

This 1.78ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a standard cut grade and certified by IGI LG784642240 or 784642240. Listed at 11 retailers as of October 30, 2026, with prices from £601 to £3,791, a £3,191 spread on the same certified stone. Yadav Diamonds lists it at £3,791. 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

1.78
Carat
D
Colour
FL
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.1°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784642240
Dimensions7.00 × 6.83 × 4.77 mm
L/W Ratio1.02
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
7.00 mm6.83 mm1.78 ctD / FL
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG784642240
Side View
Table 66.0%Crown 38.1°Girdle: STK-VTKPavilion 40.1°Culet: NoneDepth 69.8%

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: £2,746 GBP|Low: £601 GBP|High: £5,135 GBP|Avg: £2,250 GBP|-36.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Yadav Diamonds
October 30, 2026
Retailer 10£601 GBP
Retailer 7£603 GBP
Retailer 2£678 GBP
Retailer 6£772 GBP
Retailer 11£855 GBP
Retailer 4£892 GBP
Retailer 9£2,235 GBP
Retailer 5£2,408 GBP
Retailer 1£2,746 GBP
Retailer 8£3,582 GBP
Yadav Diamonds£3,791 GBP
Retailer 3£4,607 GBP

25 data points across 12 retailers

11 retailers£601 GBP to £3,791 GBP

A
Cheapest Retailer
-
£601 GBP
$805 USD
A
Retailer 2
-
£603 GBP
$808 USD
View
A
Retailer 3
-
£678 GBP
$908 USD
View
Final sale: no returns
A
Retailer 4
-
£772 GBP
$1,035 USD
View
A
Retailer 5
-
£855 GBP
$1,145 USD
View
A
Retailer 6
-
£892 GBP
€1,138 EUR
View
Retailer 7
-
£2,235 GBP
$2,995 USD
View
Price last confirmed 11 days ago
B
Retailer 8
-
£2,408 GBP
View
B
Retailer 9
-
£2,746 GBP
$3,680 USD
View
B
Retailer 10
-
£3,582 GBP
$4,800 USD
View
Most Expensive
B
Yadav Diamonds
12865081 · Oct 30
£3,791 GBP
$5,080 USD
View
10 more retailers have this diamond
Prices start from £601 GBPSave up to £3,191 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
1.78ct Cushion
£601 GBP