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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 $1,583 SGD
$1,238 USD
As of October 31, 2026
Save $5,653 SGD (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $12,720 SGD 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 31, 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: $2,584 SGD|Low: $1,583 SGD|High: $7,453 SGD|Avg: $3,680 SGD|-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$1,583 SGD
Retailer 5$1,603 SGD
Retailer 15$1,662 SGD
Retailer 12$1,886 SGD
Retailer 10$2,339 SGD
Retailer 1$2,584 SGD
Retailer 8$3,372 SGD
Retailer 11$3,867 SGD
Retailer 3$4,256 SGD
Retailer 4$4,423 SGD
Retailer 6$4,506 SGD
Retailer 14$4,811 SGD
Retailer 9$5,924 SGD
Retailer 2$6,037 SGD
Retailer 13$7,236 SGD

42 data points across 15 retailers

16 retailers$1,583 SGD to $7,236 SGD

A
Cheapest Retailer
-
$1,583 SGD
$1,238 USD
A
Retailer 2
-
$1,603 SGD
$1,254 USD
View
Final sale: no returns
A
Retailer 3
-
$1,886 SGD
$1,475 USD
View
B+
Retailer 4
-
$2,339 SGD
$1,830 USD
View
B+
Retailer 5
-
$2,584 SGD
£1,591 GBP
View
B+
Retailer 6
-
$3,372 SGD
ZAR 42,611 ZAR
View
B
Retailer 7
-
$4,256 SGD
$3,329 USD
View
B
Retailer 8
-
$4,423 SGD
£2,724 GBP
View
B
Retailer 9
-
$4,506 SGD
$3,524 USD
View
B
Retailer 10
-
$4,811 SGD
$3,763 USD
View
B
Retailer 11
-
$5,228 SGD
$4,089 USD
View
B
Retailer 12
-
$5,924 SGD
£3,649 GBP
View
B
Retailer 13
-
$6,037 SGD
$4,723 USD
View
B
Retailer 14
-
$6,511 SGD
$5,093 USD
View
B
Retailer 15
-
$7,236 SGD
$5,660 USD
View
Most Expensive
Do Amore Diamonds
27-B8207601F · Oct 31
$12,720 SGD
$9,950 USD
View
Price under review
15 more retailers have this diamond
Prices start from $1,583 SGDSave up to $5,653 SGD

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
$1,583 SGD