[Code of Federal Regulations] [Title 16, Volume 1] [Revised as of January 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 16CFR23.15] [Page 149] TITLE 16--COMMERCIAL PRACTICES CHAPTER I--FEDERAL TRADE COMMISSION PART 23_GUIDES FOR THE JEWELRY, PRECIOUS METALS, AND PEWTER INDUSTRIES --Table of Contents Sec. 23.15 Misuse of the term ``properly cut,'' etc. It is unfair or deceptive to use the terms ``properly cut,'' ``proper cut,'' ``modern cut,'' or any representation of similar meaning to describe any diamond that is lopsided, or is so thick or so thin in depth as to detract materially from the brilliance of the stone. Note to Sec. 23.15: Stones that are commonly called ``fisheye'' or ``old mine'' should not be described as ``properly cut,'' ``modern cut,'' etc.