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<p>[QUOTE=&quot;Cherryhill, post: 421774, member: 70&quot;]I cannot see what i need to see, but the originals of these, made in the late&nbsp; &nbsp; &nbsp;&nbsp; 19th century were ground and polished on the top, sometimes leaving the top cavities open.&nbsp; (Cavities?) the first gather of these on the blow pipe is blown into a mold which imparts ridges on the outside of the piece. It is then coated over with a very thin layer of glass, closing/sealing the diamonds. If the top row is ground leaving openings they can accumulate dirt, which shows up as black in the opening. </p><p><br /></p><p>Modern pieces are fire polished, which seals the openings, but isn&#039;t flat as are the originals. Modern being Post WWII. </p><p><br /></p><p>Before these are sold, they are subjected to a very light acid bath, leaving the exterior as &#039;satin.&#039;&nbsp; Its the reflection off the inside of the bubble reacting with the satin which gives the MOP (mother of pearl) effect. </p><p><br /></p><p>More than you wanted to know.[/QUOTE]</p><p><br /></p>

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