In the pantheon of Quartz crystals, a closed, Smoky Quartz Gwindel from Switzerland is certainly among the rarest, and most coveted, of Quartz specimens. This thumbnail is perfectly gemmy throughout, with good luster and the very-rare closed gwindel habit. With only minor edgewear, this is really quite an exceptional thumbnail for rarity, habit, and aesthetics. Better in person, even. I cannot recall seeing a THUMBNAIL example of the habit for a thumbnail suite, that was so balanced and fine. From an old Swiss collection.