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Marquise|Lab Grown|IGI

1.28ct F IF Marquise Lab Grown Diamond

EX • F/IF • IGI LG775631966

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG775631966

Diamond specifications and retailer prices

From $468 USD
As of November 6, 2026
Save $921 USD (66%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $1,510 USD at Rare Carat · As of October 28, 2026
View at Rare Carat

About this 1.28ct lab-grown marquise diamond

This 1.28ct lab-grown marquise sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG775631966 or 775631966. Listed at 9 retailers as of November 2, 2026, with a 197% 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

1.28
Carat
F
Color
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG775631966
Dimensions10.72 × 5.79 × 3.60 mm
L/W Ratio1.85
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
10.72 mm5.79 mm1.28 ctF / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG775631966
Side View
Table 57.0%Crown 35.7°Girdle: MED-STKPavilion 39.8°Culet: NoneDepth 62.2%

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 6
Current: $1,510 USD|Low: $468 USD|High: $1,535 USD|Avg: $930 USD|-1.6%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7$468 USD
Retailer 2$544 USD
Retailer 3$605 USD
Retailer 6$674 USD
Retailer 5$903 USD
Retailer 8$1,165 USD
Retailer 9$1,194 USD
Retailer 4$1,389 USD
Rare Carat$1,510 USD

44 data points across 9 retailers

9 retailers$468 USD to $1,389 USD

A
Cheapest Retailer
-
$468 USD
A
Retailer 2
-
$544 USD
View
A
Retailer 3
-
$605 USD
View
A
Retailer 4
-
$674 USD
View
B+
Retailer 5
-
$903 USD
View
B
Retailer 6
-
$1,165 USD
View
Retailer 7
-
$1,194 USD
View
Price last confirmed 35 days ago
B
Retailer 8
-
$1,389 USD
View
Most Expensive
Rare Carat
HP6314_l_775631966 · Oct 28
$1,510 USD
View
Price last confirmed 9 days ago
8 more retailers have this diamond
Prices start from $468 USDSave up to $921 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
1.28ct Marquise
$468 USD