Tweezers

"I first discovered the zircon in 1957. When the piano player in this band I had in high school decided that in order to really play like Fats Domino he had to have the same amount of weight on his hands that Fats Domino had. You know, Fats had that big diamond ring on his finger.

"Well, Wimberly couldn't afford a diamond, so he saw an ad in a comic book said he could get a zircon as big as yer fist for £10." [...] "So the zircon has always seemed to me the symbol of complete cheapness."
(Interview in Melody Maker, July 20, 1974, Grand Mother.)

"... a tweezer, as an object of sexual gratification, is the ultimate extension. If you have something hard to grab, the tweezer is handy. So the tweezer has many conceptual usages. And when you take any object and zircon-encrust it ... get the drift?"
(Interview in American Eye, October 23, 1974, Frank Zappa: a Mother Only a Face Could Love.)

See also:

Grand Mother
Dinah-Moe Humm
Frank Zappa: a Mother Only a Face Could Love