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Cushion|Lab Grown|IGI

1.78ct D IF Cushion Lab Grown Diamond

VG • D/IF • IGI LG791618528

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG791618528

Diamond specifications and retailer prices

From £924 GBP
$1,238 USD
As of October 31, 2026
Save £3,300 GBP (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £7,426 GBP at Do Amore Diamonds · As of October 29, 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 IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG791618528 or 791618528. Listed at 16 retailers as of October 29, 2026, with a 357% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle30.2°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG791618528
Dimensions8.79 × 6.48 × 4.07 mm
L/W Ratio1.36
Girdle conditionFaceted
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
8.79 mm6.48 mm1.78 ctD / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG791618528
Side View
Table 59.0%Crown 30.2°Girdle: MED-STKPavilion 33.6°Culet: NoneDepth 62.7%

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: £1,508 GBP|Low: £924 GBP|High: £4,351 GBP|Avg: £2,142 GBP|-0.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
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Retailer 15
October 30, 2026
Retailer 7£924 GBP
Retailer 5£936 GBP
Retailer 15£970 GBP
Retailer 12£1,101 GBP
Retailer 10£1,366 GBP
Retailer 1£1,508 GBP
Retailer 8£1,969 GBP
Retailer 11£2,258 GBP
Retailer 3£2,485 GBP
Retailer 4£2,582 GBP
Retailer 6£2,630 GBP
Retailer 14£2,808 GBP
Retailer 9£3,459 GBP
Retailer 2£3,525 GBP
Retailer 13£4,224 GBP

42 data points across 15 retailers

16 retailers£924 GBP to £4,224 GBP

A
Cheapest Retailer
-
£924 GBP
$1,238 USD
A
Retailer 2
-
£936 GBP
$1,254 USD
View
Final sale: no returns
A
Retailer 3
-
£1,101 GBP
$1,475 USD
View
B+
Retailer 4
-
£1,366 GBP
$1,830 USD
View
B+
Retailer 5
-
£1,508 GBP
View
B+
Retailer 6
-
£1,969 GBP
ZAR 42,611 ZAR
View
B
Retailer 7
-
£2,485 GBP
$3,329 USD
View
B
Retailer 8
-
£2,582 GBP
View
B
Retailer 9
-
£2,630 GBP
$3,524 USD
View
B
Retailer 10
-
£2,808 GBP
$3,763 USD
View
B
Retailer 11
-
£3,052 GBP
$4,089 USD
View
B
Retailer 12
-
£3,459 GBP
View
B
Retailer 13
-
£3,525 GBP
$4,723 USD
View
B
Retailer 14
-
£3,801 GBP
$5,093 USD
View
B
Retailer 15
-
£4,224 GBP
$5,660 USD
View
Most Expensive
Do Amore Diamonds
27-B8207601F · Oct 29
£7,426 GBP
$9,950 USD
View
Price under review
15 more retailers have this diamond
Prices start from £924 GBPSave up to £3,300 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
£924 GBP