Mailing Standards of the United States Postal Service - International Mail Manual > 1 International Mail Services > 130 Mailability > 134 Valuable Articles
The following services can be used to send the articles noted in 134.2:
Note: Priority Mail Express International service cannot be used to send the articles noted in 134.2.
The following valuable articles may be sent only with the services noted in 134.1:
Note: The term “jewelry” is generally understood to denote articles of more than nominal value. Inexpensive jewelry, watches, such as tie clasps and costume jewelry, containing little or no precious metal, is not considered to be jewelry within the meaning of this section and is accepted under the same conditions as other mailable merchandise to any country. Inexpensive jewelry is accepted to countries that prohibit jewelry, but only at the sender’s risk.
The exportation (mailing) from the United States of any rough diamond (regardless of size, source, or value) is prohibited unless the rough diamond has been controlled through the Kimberley Process Certification Scheme. See 560 for the complete mailing standards of these items.
Individual countries prohibit or restrict some or all of the valuable items listed above. See the “Prohibitions and Restrictions” section in the Individual Country Listings.