16 CFR § 23.16 - Misuse of the term “properly cut,” etc.

---
identifier: "/us/cfr/t16/s23.16"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "16 CFR § 23.16 - Misuse of the term “properly cut,” etc."
title_number: 16
title_name: "Commercial Practices"
section_number: "23.16"
section_name: "Misuse of the term “properly cut,” etc."
chapter_name: "FEDERAL TRADE COMMISSION"
subchapter_number: "B"
subchapter_name: "GUIDES AND TRADE PRACTICE RULES"
part_number: "23"
part_name: "GUIDES FOR THE JEWELRY, PRECIOUS METALS, AND PEWTER INDUSTRIES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 45, 46."
regulatory_source: "83 FR 40667, Aug. 16, 2018, unless otherwise noted."
cfr_part: "23"
---


# 23.16 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.

Stones that are commonly called “fisheye” or “old mine” should not be described as “properly cut,” “modern cut,” etc.