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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 $2,200 NZD
$1,238 USD
As of October 31, 2026
Save $7,859 NZD (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $17,684 NZD 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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $8,194 NZD|Low: $2,229 NZD|High: $10,362 NZD|Avg: $5,355 NZD
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
November 1, 2026
Retailer 5$2,229 NZD
Retailer 14$2,310 NZD
Retailer 11$2,622 NZD
Retailer 9$3,252 NZD
Retailer 7$3,592 NZD
Retailer 8$4,688 NZD
Retailer 10$5,376 NZD
Retailer 3$5,917 NZD
Retailer 4$6,149 NZD
Retailer 6$6,264 NZD
Retailer 13$6,688 NZD
Retailer 1$8,194 NZD
Retailer 2$8,394 NZD
Retailer 12$10,060 NZD

42 data points across 14 retailers

16 retailers$2,200 NZD to $10,060 NZD

A
Cheapest Retailer
-
$2,200 NZD
$1,238 USD
A
Retailer 2
-
$2,229 NZD
$1,254 USD
View
Final sale: no returns
A
Retailer 3
-
$2,622 NZD
$1,475 USD
View
B+
Retailer 4
-
$3,252 NZD
$1,830 USD
View
B+
Retailer 5
-
$3,592 NZD
£1,591 GBP
View
B+
Retailer 6
-
$4,688 NZD
ZAR 42,611 ZAR
View
B
Retailer 7
-
$5,917 NZD
$3,329 USD
View
B
Retailer 8
-
$6,149 NZD
£2,724 GBP
View
B
Retailer 9
-
$6,264 NZD
$3,524 USD
View
B
Retailer 10
-
$6,688 NZD
$3,763 USD
View
B
Retailer 11
-
$7,268 NZD
$4,089 USD
View
B
Retailer 12
-
$8,194 NZD
£3,630 GBP
View
B
Retailer 13
-
$8,394 NZD
$4,723 USD
View
B
Retailer 14
-
$9,052 NZD
$5,093 USD
View
B
Retailer 15
-
$10,060 NZD
$5,660 USD
View
Most Expensive
Do Amore Diamonds
27-B8207601F · Oct 31
$17,684 NZD
$9,950 USD
View
Price under review
15 more retailers have this diamond
Prices start from $2,200 NZDSave up to $7,859 NZD

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
$2,200 NZD