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One is whether or not there are alternating colors in the core, and another is the appearance of the core itself, specifically how well defined the lattice is.Solid Core Swirls come in several different forms, though the one pervasive trait all have is that the core appears solid, with no or at the very most minor openings.Latticinio Swirls are the most common type of hand made glass marble.Compared to most other handmade marbles, Latticinio Swirls have little value, though there are several factors that can increase their value, other than large size and/or rarity of colors (especially core color).However, most have such an outer layer and this almost always consists of either single colored strands or multicolored bands.The bands are most often of two different color schemes, alternating with one another (four and six bands are the rule though exceptions can occur), while the strands occur in sets, usually four, and may have two to five or more strands in each set.
The colors are typically opaque, though translucent strands do occur, especially in white examples.Like Latticinio Swirls, Solid Core Swirls almost always possess an outer design that most often consists of alternating colored bands or sets of typically white and/or yellow strands.When strands occur at equidistantly spaced intervals and are very close together all the way around the marble, the marble is considered "caged." "Naked" specimens lacking the outer layer are not uncommon.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.
Another factor that may positively affect the value of a Transparent Swirl is if it is from the end or beginning of the cane.