[Code of Federal Regulations]
[Title 16, Volume 1]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 16CFR23.18]

[Page 149-150]
 
                     TITLE 16--COMMERCIAL PRACTICES
 
                   CHAPTER I--FEDERAL TRADE COMMISSION
 
PART 23_GUIDES FOR THE JEWELRY, PRECIOUS METALS, AND PEWTER INDUSTRIES
--Table of Contents
 
Sec. 23.18  Definitions of various pearls.

    As used in these guides, the terms set forth below have the 
following meanings:
    (a) Pearl: A calcareous concretion consisting essentially of 
alternating concentric layers of carbonate of lime and organic material 
formed within the body of certain mollusks, the result of an abnormal 
secretory process caused by an irritation of the mantle of the mollusk 
following the intrusion of some foreign body inside the shell of the 
mollusk, or due to some abnormal physiological condition in the mollusk, 
neither of which has in any way been caused or induced by humans.
    (b) Cultured pearl: The composite product created when a nucleus 
(usually a sphere of calcareous mollusk shell) planted by humans inside 
the shell or in the mantle of a mollusk is coated with nacre by the 
mollusk.

[[Page 150]]

    (c) Imitation pearl: A manufactured product composed of any material 
or materials that simulate in appearance a pearl or cultured pearl.
    (d) Seed pearl: A small pearl, as defined in (a), that measures 
approximately two millimeters or less.