Peltier citrus family marbles have some specific characteristics.

Base glass.will be a milky translucent white. Colors of the ribbons determine the type of citrus.

There are six primary types but variations do occur such as "burnt" specimens.  

White base glass, opaque yellow and transparent blue ribbons - Blueberry Citrus


White base glass, transparent red and green ribbons - Christmas Tree Citrus


White base glass, transparent blue and opaque orange / red ribbons - Liberty Citrus


White base glass, opaque yellow and transparent green ribbons possible some hints of orange - Lemon Lime Citrus


White base glass, opaque yellow ribbons and dark transparent plum - Plum Citrus


Transparent clear base glass, opaque white ribbons, opaque yellow ribbons and transparent red ribbons - Ketchup & Mustard Citrus