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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG818655859

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG818655859

Diamond specifications and retailer prices

From HK$12,970 HKD
$1,653 USD
As of November 2, 2026
Save HK$41,482 HKD (76%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: HK$54,452 HKD at With Clarity · As of November 2, 2026
View at With Clarity

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 LG818655859 or 818655859. Listed at 14 retailers as of November 2, 2026, with prices from HK$12,970 to HK$54,452, a HK$41,482 spread on the same certified stone. With Clarity lists it at HK$54,452. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818655859
Dimensions12.21 × 6.24 × 4.04 mm
L/W Ratio1.96
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
12.21 mm6.24 mm1.78 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818655859
Side View
Table 58.0%Crown 37°Girdle: Slightly ThickPavilion 40°Culet: NoneDepth 64.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: HK$15,474 HKD|Low: HK$12,962 HKD|High: HK$53,361 HKD|Avg: HK$25,968 HKD|-1.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
With Clarity
November 2, 2026
Retailer 2HK$12,970 HKD
Retailer 3HK$13,056 HKD
Retailer 1HK$15,474 HKD
Retailer 11HK$16,100 HKD
Retailer 7HK$17,169 HKD
Retailer 10HK$19,066 HKD
Retailer 8HK$19,609 HKD
Retailer 12HK$30,882 HKD
Retailer 6HK$32,954 HKD
Retailer 9HK$34,318 HKD
Retailer 5HK$36,857 HKD
Retailer 4HK$37,356 HKD
With ClarityHK$53,361 HKD

42 data points across 13 retailers

14 retailersHK$12,970 HKD to HK$54,452 HKD

A
Cheapest Retailer
-
HK$12,970 HKD
$1,653 USD
A
Retailer 2
-
HK$13,056 HKD
View
A
Retailer 3
-
HK$13,966 HKD
$1,780 USD
View
A
Retailer 4
-
HK$15,474 HKD
£1,553 GBP
View
B+
Retailer 5
-
HK$16,100 HKD
$2,052 USD
View
B+
Retailer 6
-
HK$17,169 HKD
€2,084 EUR
View
B+
Retailer 7
-
HK$19,066 HKD
$2,430 USD
View
B+
Retailer 8
-
HK$19,609 HKD
ZAR 40,374 ZAR
View
B+
Retailer 9
-
HK$30,882 HKD
$3,936 USD
View
B+
Retailer 10
-
HK$32,954 HKD
$4,200 USD
View
B+
Retailer 11
-
HK$34,318 HKD
£3,444 GBP
View
Price last confirmed 7 days ago
B
Retailer 12
-
HK$36,857 HKD
A$7,227 AUD
View
B
Retailer 13
-
HK$37,356 HKD
$4,761 USD
View
Most Expensive
B
With Clarity
818655859 · Nov 2
HK$54,452 HKD
$6,940 USD
View
13 more retailers have this diamond
Prices start from HK$12,970 HKDSave up to HK$41,482 HKD

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
HK$12,970 HKD