CaratHunter
Plans
Cushion|Lab Grown|IGI

1.78ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG784646409

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

Certificate IGI LG784646409

Diamond specifications and retailer prices

From £640 GBP
$858 USD
As of October 30, 2026
Save £3,233 GBP (83%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,873 GBP at Do Amore Diamonds · As of October 30, 2026
View at Do Amore 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 top-tier cut grade and certified by IGI LG784646409 or 784646409. Listed at 10 retailers as of October 30, 2026, with prices from £640 to £3,873, a £3,233 spread on the same certified stone. Do Amore Diamonds lists it at £3,873. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle38.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784646409
Dimensions7.19 × 7.02 × 4.57 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
7.19 mm7.02 mm1.78 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG784646409
Side View
Table 64.0%Crown 34.2°Girdle: STK-THKPavilion 38.7°Culet: NoneDepth 65.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £3,873 GBP|Low: £484 GBP|High: £5,135 GBP|Avg: £1,791 GBP|-24.6%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6£640 GBP
Retailer 8£649 GBP
Retailer 10£678 GBP
Retailer 5£832 GBP
Retailer 9£863 GBP
Retailer 2£956 GBP
Retailer 7£2,235 GBP
Retailer 4£2,357 GBP
Retailer 3£2,746 GBP
Do Amore Diamonds£3,873 GBP

29 data points across 10 retailers

10 retailers£640 GBP to £3,873 GBP

A
Cheapest Retailer
-
£640 GBP
$858 USD
A
Retailer 2
-
£649 GBP
$870 USD
View
A
Retailer 3
-
£678 GBP
$908 USD
View
Final sale: no returns
A
Retailer 4
-
£832 GBP
$1,115 USD
View
A
Retailer 5
-
£863 GBP
$1,156 USD
View
A
Retailer 6
-
£956 GBP
€1,220 EUR
View
Retailer 7
-
£2,235 GBP
$2,995 USD
View
Price last confirmed 11 days ago
B+
Retailer 8
-
£2,357 GBP
View
B
Retailer 9
-
£2,746 GBP
$3,680 USD
View
Most Expensive
B
Do Amore Diamonds
27-543E47EED · Oct 30
£3,873 GBP
$5,190 USD
View
9 more retailers have this diamond
Prices start from £640 GBPSave up to £3,233 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
£640 GBP