Solid colored cores often have strands on their surface, either straight or twisted around the core.
Sometimes these strands "float" well above the core; in such cases the marble is considered "trilevel." The most common core colors are yellow and white when the core is solid colored; otherwise a wide variety of colored bands may comprise the core.
Like Latticinio Swirls, the base glass is almost always colorless, though on rare occasions it may be colored.
The core may be cylindrical or it may have lobes, and it may either be transparent or opaque.
Hand made glass marbles were invented in Lauscha, Germany, in the late 1840s.
They were produced until the early part of the twentieth century, when World War I and the invention of marble producing machinery in America effectively ended the hand made marble industry.
On rare occasions there will be two colors in the core, and usually these colors alternate.
The colors are typically opaque, though translucent strands do occur, especially in white examples.Another factor that may positively affect the value of a Transparent Swirl is if it is from the end or beginning of the cane.End-of-cane examples have a design that terminates somewhere inside the marble without reaching the other side; since they are the last marble off the cane there will only be one pontil, and it is from this that the design originates.Now and then the strands will be divided, typically into three different sets.The color of the core is white, yellow, orange, red, green, and blue, in increasing order of rarity.However, most have such an outer layer and this almost always consists of either single colored strands or multicolored bands.