CFR > Title 16 - Commercial Practices > CHAPTER I—FEDERAL TRADE COMMISSION > SUBCHAPTER B—GUIDES AND TRADE PRACTICE RULES (parts 17 to 260) > PART 23—GUIDES FOR THE JEWELRY, PRECIOUS METALS, AND PEWTER INDUSTRIES > 23.15—Misuse of the term “properly cut,” etc.

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.

Code of Federal Regulations

Note to § 23.15 : Stones that are commonly called “fisheye” or “old mine” should not be described as “properly cut,” “modern cut,” etc.
Code of Federal Regulations 156