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These are rare because most marbles from the end of the cane were mis-shaped or just not very pleasing to the maker, and were rejected.
The color of the core is white, yellow, orange, red, green, and blue, in increasing order of rarity.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.I have found the marble information and condensed this on one page.Alan Basinet is the author to all the pictures and information below.
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.