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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG754563659

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG754563659

Diamond specifications and retailer prices

From $1,512 AUD
$1,062 USD
As of November 2, 2026
Save $5,805 AUD (79%) vs most expensive(unlock to see where)
34 retailers carry this diamond
Most expensive: $13,425 AUD at Do Amore Diamonds · As of November 2, 2026
View at Do Amore Diamonds

About this 1.78ct lab-grown marquise diamond

This 1.78ct lab-grown marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG754563659 or 754563659. Listed at 34 retailers as of October 31, 2026, with a 384% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754563659
Dimensions12.56 × 6.36 × 3.83 mm
L/W Ratio1.97
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
12.56 mm6.36 mm1.78 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754563659
Side View
Table 63.0%Crown 35.3°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 60.2%

Caratlytics Score

How it works →
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: Nov 2
Current: $13,425 AUD|Low: $1,512 AUD|High: $13,425 AUD|Avg: $3,985 AUD
Do Amore Diamonds
Retailer 2
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Retailer 7
Retailer 8
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Retailer 12
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Retailer 15
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Retailer 17
Retailer 18
Retailer 19
Retailer 20
Retailer 21
Retailer 22
Retailer 23
November 2, 2026
Retailer 7$1,512 AUD
Retailer 10$1,644 AUD
Retailer 11$1,730 AUD
Retailer 16$1,745 AUD
Retailer 15$1,939 AUD
Retailer 3$2,000 AUD
Retailer 14$2,051 AUD
Retailer 23$2,199 AUD
Retailer 2$2,808 AUD
Retailer 8$2,921 AUD
Retailer 18$3,115 AUD
Retailer 22$3,210 AUD
Retailer 4$3,556 AUD
Retailer 19$3,558 AUD
Retailer 13$4,818 AUD
Retailer 21$4,977 AUD
Retailer 6$5,435 AUD
Retailer 5$5,558 AUD
Retailer 20$6,252 AUD
Retailer 17$6,698 AUD
Retailer 12$7,129 AUD
Retailer 9$7,317 AUD
Do Amore Diamonds$13,425 AUD

44 data points across 23 retailers

34 retailers$1,512 AUD to $7,317 AUD

A
Cheapest Retailer
-
$1,512 AUD
$1,062 USD
Retailer 2
-
$1,512 AUD
$1,062 USD
View
Price last confirmed 25 days ago
Retailer 3
-
$1,512 AUD
$1,062 USD
View
Price last confirmed 33 days ago
Retailer 4
-
$1,644 AUD
$1,155 USD
View
Price last confirmed 34 days ago
Retailer 5
-
$1,730 AUD
$1,215 USD
View
Price last confirmed 34 days ago
A
Retailer 6
-
$1,745 AUD
$1,226 USD
View
Retailer 7
-
$1,754 AUD
$1,232 USD
View
Price last confirmed 30 days ago
Retailer 8
-
$1,754 AUD
$1,232 USD
View
Price last confirmed 22 days ago
A
Retailer 9
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$1,939 AUD
$1,362 USD
View
Final sale: no returns
A
Retailer 10
-
$2,000 AUD
$1,405 USD
View
A
Retailer 11
-
$2,051 AUD
$1,441 USD
View
Retailer 12
-
$2,199 AUD
£1,216 GBP
View
Price last confirmed 16 days ago
A
Retailer 13
-
$2,460 AUD
HK$13,500 HKD
View
A
Retailer 14
-
$2,808 AUD
£1,553 GBP
View
B+
Retailer 15
-
$2,921 AUD
$2,052 USD
View
B+
Retailer 16
-
$3,115 AUD
€2,084 EUR
View
B+
Retailer 17
-
$3,210 AUD
$2,255 USD
View
B+
Retailer 18
-
$3,556 AUD
$2,498 USD
View
B+
Retailer 19
-
$3,558 AUD
ZAR 40,374 ZAR
View
Retailer 20
-
$3,627 AUD
$2,548 USD
View
Price last confirmed 23 days ago
B+
Retailer 21
-
$3,627 AUD
$2,548 USD
View
Retailer 22
-
$3,627 AUD
$2,548 USD
View
Price last confirmed 32 days ago
B+
Retailer 23
-
$4,818 AUD
View
B
Retailer 24
-
$4,977 AUD
$3,496 USD
View
Retailer 25
-
$5,017 AUD
$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 26
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$5,337 AUD
£2,952 GBP
View
B
Retailer 27
-
$5,435 AUD
$3,818 USD
View
B
Retailer 28
-
$5,558 AUD
$3,904 USD
View
B
Retailer 29
-
$6,252 AUD
£3,458 GBP
View
B
Retailer 30
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$6,698 AUD
View
B
Retailer 31
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$6,874 AUD
$4,829 USD
View
B
Retailer 32
-
$7,129 AUD
SGD 6,767 SGD
View
B
Retailer 33
-
$7,317 AUD
$5,140 USD
View
Most Expensive
Do Amore Diamonds
27-5CCC7A6A6 · Nov 2
$13,425 AUD
$9,430 USD
View
Price under review
33 more retailers have this diamond
Prices start from $1,512 AUDSave up to $5,805 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 Marquise
$1,512 AUD