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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG762545210

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG762545210

Diamond specifications and retailer prices

From $1,749 AUD
$1,226 USD
As of November 2, 2026
Save $5,141 AUD (75%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $6,890 AUD at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

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 LG762545210 or 762545210. Listed at 14 retailers as of October 31, 2026, with prices from $1,749 to $6,890, a $5,141 spread on the same certified stone. Taylor and Hart lists it at $6,890. 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 angle33.6°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG762545210
Dimensions12.52 × 6.38 × 3.89 mm
L/W Ratio1.96
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
12.52 mm6.38 mm1.78 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG762545210
Side View
Table 59.0%Crown 33.6°Girdle: STK-THKPavilion 39.6°Culet: NoneDepth 61.0%

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: $2,814 AUD|Low: $1,749 AUD|High: $6,815 AUD|Avg: $3,831 AUD|-1.2%
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
November 2, 2026
Retailer 3$1,749 AUD
Retailer 2$2,056 AUD
Retailer 1$2,814 AUD
Retailer 11$2,827 AUD
Retailer 12$2,928 AUD
Retailer 9$3,122 AUD
Retailer 5$3,309 AUD
Retailer 10$3,566 AUD
Retailer 4$5,029 AUD
Retailer 13$5,448 AUD
Retailer 8$5,579 AUD
Retailer 6$6,232 AUD
Retailer 7$6,713 AUD

36 data points across 13 retailers

14 retailers$1,749 AUD to $6,890 AUD

A
Cheapest Retailer
-
$1,749 AUD
$1,226 USD
A
Retailer 2
-
$2,056 AUD
$1,441 USD
View
A
Retailer 3
-
$2,466 AUD
HK$13,500 HKD
View
A
Retailer 4
-
$2,814 AUD
£1,553 GBP
View
B+
Retailer 5
-
$2,827 AUD
View
B+
Retailer 6
-
$2,928 AUD
$2,052 USD
View
B+
Retailer 7
-
$3,122 AUD
€2,084 EUR
View
B+
Retailer 8
-
$3,566 AUD
ZAR 40,374 ZAR
View
Retailer 9
-
$5,029 AUD
$3,524 USD
View
Price last confirmed 18 days ago
B
Retailer 10
-
$5,448 AUD
$3,818 USD
View
B+
Retailer 11
-
$5,579 AUD
$3,910 USD
View
B
Retailer 12
-
$6,232 AUD
£3,439 GBP
View
B
Retailer 13
-
$6,713 AUD
View
Most Expensive
B
Taylor and Hart
13F30F8 · Oct 31
$6,890 AUD
$4,829 USD
View
13 more retailers have this diamond
Prices start from $1,749 AUDSave up to $5,141 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
$1,749 AUD