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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 $1,062 USD
As of November 2, 2026
Save $4,078 USD (79%) vs most expensive(unlock to see where)
34 retailers carry this diamond
Most expensive: $9,430 USD 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
Color
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

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 2
Current: $9,430 USD|Low: $1,062 USD|High: $9,430 USD|Avg: $2,799 USD
Do Amore Diamonds
Retailer 2
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Retailer 23
November 2, 2026
Retailer 7$1,062 USD
Retailer 10$1,155 USD
Retailer 11$1,215 USD
Retailer 16$1,226 USD
Retailer 15$1,362 USD
Retailer 3$1,405 USD
Retailer 14$1,441 USD
Retailer 23$1,545 USD
Retailer 2$1,972 USD
Retailer 8$2,052 USD
Retailer 18$2,188 USD
Retailer 22$2,255 USD
Retailer 4$2,498 USD
Retailer 19$2,499 USD
Retailer 13$3,385 USD
Retailer 21$3,496 USD
Retailer 6$3,818 USD
Retailer 5$3,904 USD
Retailer 20$4,392 USD
Retailer 17$4,705 USD
Retailer 12$5,008 USD
Retailer 9$5,140 USD
Do Amore Diamonds$9,430 USD

44 data points across 23 retailers

34 retailers$1,062 USD to $5,140 USD

A
Cheapest Retailer
-
$1,062 USD
Retailer 2
-
$1,062 USD
View
Price last confirmed 24 days ago
Retailer 3
-
$1,062 USD
View
Price last confirmed 33 days ago
Retailer 4
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$1,155 USD
View
Price last confirmed 34 days ago
Retailer 5
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$1,215 USD
View
Price last confirmed 34 days ago
A
Retailer 6
-
$1,226 USD
View
Retailer 7
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$1,232 USD
View
Price last confirmed 30 days ago
Retailer 8
-
$1,232 USD
View
Price last confirmed 22 days ago
A
Retailer 9
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$1,362 USD
View
Final sale: no returns
A
Retailer 10
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$1,405 USD
View
A
Retailer 11
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$1,441 USD
View
Retailer 12
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$1,545 USD
£1,216 GBP
View
Price last confirmed 16 days ago
A
Retailer 13
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$1,728 USD
HK$13,500 HKD
View
A
Retailer 14
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$1,972 USD
£1,553 GBP
View
B+
Retailer 15
-
$2,052 USD
View
B+
Retailer 16
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$2,188 USD
€2,084 EUR
View
B+
Retailer 17
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$2,255 USD
View
B+
Retailer 18
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$2,498 USD
View
B+
Retailer 19
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$2,499 USD
ZAR 40,374 ZAR
View
Retailer 20
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$2,548 USD
View
Price last confirmed 22 days ago
B+
Retailer 21
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$2,548 USD
View
Retailer 22
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$2,548 USD
View
Price last confirmed 32 days ago
B+
Retailer 23
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$3,385 USD
A$5,207 AUD
View
B
Retailer 24
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$3,496 USD
View
Retailer 25
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$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 26
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$3,749 USD
£2,952 GBP
View
B
Retailer 27
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$3,818 USD
View
B
Retailer 28
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$3,904 USD
View
B
Retailer 29
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$4,392 USD
£3,458 GBP
View
B
Retailer 30
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$4,705 USD
A$7,238 AUD
View
B
Retailer 31
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$4,829 USD
View
B
Retailer 32
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$5,008 USD
SGD 6,767 SGD
View
B
Retailer 33
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$5,140 USD
View
Most Expensive
Do Amore Diamonds
27-5CCC7A6A6 · Nov 2
$9,430 USD
View
Price under review
33 more retailers have this diamond
Prices start from $1,062 USDSave up to $4,078 USD

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
$1,062 USD