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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 $1,762 AUD
$1,238 USD
As of October 31, 2026
Save $6,295 AUD (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $14,165 AUD at Do Amore Diamonds · As of October 31, 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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Price History

Last verified: Oct 31
Current: $2,877 AUD|Low: $1,762 AUD|High: $8,300 AUD|Avg: $4,087 AUD|-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
Retailer 13
Retailer 14
Retailer 15
October 31, 2026
Retailer 7$1,762 AUD
Retailer 5$1,785 AUD
Retailer 15$1,851 AUD
Retailer 12$2,100 AUD
Retailer 10$2,605 AUD
Retailer 1$2,877 AUD
Retailer 8$3,755 AUD
Retailer 11$4,306 AUD
Retailer 3$4,739 AUD
Retailer 4$4,925 AUD
Retailer 6$5,017 AUD
Retailer 14$5,357 AUD
Retailer 9$6,597 AUD
Retailer 2$6,723 AUD
Retailer 13$8,058 AUD

43 data points across 15 retailers

16 retailers$1,762 AUD to $8,058 AUD

A
Cheapest Retailer
-
$1,762 AUD
$1,238 USD
A
Retailer 2
-
$1,785 AUD
$1,254 USD
View
Final sale: no returns
A
Retailer 3
-
$2,100 AUD
$1,475 USD
View
B+
Retailer 4
-
$2,605 AUD
$1,830 USD
View
B+
Retailer 5
-
$2,877 AUD
£1,591 GBP
View
B+
Retailer 6
-
$3,755 AUD
ZAR 42,611 ZAR
View
B
Retailer 7
-
$4,739 AUD
$3,329 USD
View
B
Retailer 8
-
$4,925 AUD
£2,724 GBP
View
B
Retailer 9
-
$5,017 AUD
$3,524 USD
View
B
Retailer 10
-
$5,357 AUD
$3,763 USD
View
B
Retailer 11
-
$5,822 AUD
$4,089 USD
View
B
Retailer 12
-
$6,597 AUD
£3,649 GBP
View
B
Retailer 13
-
$6,723 AUD
$4,723 USD
View
B
Retailer 14
-
$7,251 AUD
$5,093 USD
View
B
Retailer 15
-
$8,058 AUD
$5,660 USD
View
Most Expensive
Do Amore Diamonds
27-B8207601F · Oct 31
$14,165 AUD
$9,950 USD
View
Price under review
15 more retailers have this diamond
Prices start from $1,762 AUDSave up to $6,295 AUD

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
$1,762 AUD