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Gary, glued combos will always have a crisp line separating the two halves. Natural combos (look at the second picture in this post) most often have a transition line where the two types of stone...

Ok, further clarification is in order for the coticule uneducated;

As Rich and others know, there are two kinds of "Combination" Coticules:

1) NATURAL Combination stones. Not bonded. Even...