This master marble is from Mark's Geometric series, each one of these a sweet piece of marble history! These incredible patterned marbles are made using the graal technique, with black glass layered over white and then the pattern meticulously laid on the marble and blasted away, then completed with a thick layer of crystal dipped and laid over the pattern which makes the whole thing absolutely pop in hand. This is one of the earliest examples of the graal tech you'll find, after Mark perfected it. The Herringbone design hasn't been made for many years, so they are especially hard to find, and this is a true classic! Signed 'Matthews 1997'.