25 C.F.R. § 301.6 Stone for ornamentation.
Title 25 - Indians
In addition to turquoise, the use of other local stone is permitted. Turquoise, if used, must be genuine stone, uncolored by any artificial means.
Title 25: Indians
PART 301—NAVAJO, PUEBLO, AND HOPI SILVER AND TURQUOISE PRODUCTS; STANDARDS
§ 301.6 Stone for ornamentation.
