Note 1 to paragraph (b): The use of the word "faux" to describe a laboratory-created or imitation stone is not an adequate disclosure that the stone is not a mined stone.
Note 2 to paragraph (b): Marketers may use the word "cultured" to describe laboratory-created gemstone products that have essentially the same optical, physical, and chemical properties as the named stone if the term (e.g., "cultured ruby") is qualified by a clear and conspicuous disclosure (for example, the words "laboratory-created," "laboratory-grown," "[manufacturer name]-created," or some other word or phrase of like meaning) conveying that the product is not a mined stone. Additional guidance regarding the use of "cultured" to describe a laboratory-created diamond is set forth in § 23.12(c)(3) .
16 C.F.R. §23.25