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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 $1,226 USD
As of November 2, 2026
Save $3,603 USD (75%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $4,829 USD 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 $1,226 to $4,829, a $3,603 spread on the same certified stone. Taylor and Hart lists it at $4,829. 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 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

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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: Nov 2
Current: $1,972 USD|Low: $1,226 USD|High: $4,776 USD|Avg: $2,685 USD|-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$1,226 USD
Retailer 2$1,441 USD
Retailer 1$1,972 USD
Retailer 11$1,981 USD
Retailer 12$2,052 USD
Retailer 9$2,188 USD
Retailer 5$2,319 USD
Retailer 10$2,499 USD
Retailer 4$3,524 USD
Retailer 13$3,818 USD
Retailer 8$3,910 USD
Retailer 6$4,368 USD
Retailer 7$4,705 USD

36 data points across 13 retailers

14 retailers$1,226 USD to $4,829 USD

A
Cheapest Retailer
-
$1,226 USD
A
Retailer 2
-
$1,441 USD
View
A
Retailer 3
-
$1,728 USD
HK$13,500 HKD
View
A
Retailer 4
-
$1,972 USD
£1,553 GBP
View
B+
Retailer 5
-
$1,981 USD
A$3,048 AUD
View
B+
Retailer 6
-
$2,052 USD
View
B+
Retailer 7
-
$2,188 USD
€2,084 EUR
View
B+
Retailer 8
-
$2,499 USD
ZAR 40,374 ZAR
View
Retailer 9
-
$3,524 USD
View
Price last confirmed 18 days ago
B
Retailer 10
-
$3,818 USD
View
B+
Retailer 11
-
$3,910 USD
View
B
Retailer 12
-
$4,368 USD
£3,439 GBP
View
B
Retailer 13
-
$4,705 USD
A$7,238 AUD
View
Most Expensive
B
Taylor and Hart
13F30F8 · Oct 31
$4,829 USD
View
13 more retailers have this diamond
Prices start from $1,226 USDSave up to $3,603 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
$1,226 USD