It's late so I will address D) for tonight This is from the draft of the Lead Determinations final rule page 28 of 65.
Lead determinations final rule Page 28
11. Glass, crystals, and rhinestones.
Several commenters listed glass, glass beads, rhinestones, leaded glass crystals, and porcelain enamel as items that should be exempted from compliance with the CPSIA requirements for lead content or testing.
While not all glass or glass products, crystals, or rhinestones contain lead at levels that exceed the CPSIA lead limits, in the absence of tests or other data on these products, we cannot verify that such products meet the CPSIA's lead content limits. Further, many leaded glass crystals and other glass-based products contain lead at levels exceeding the statutory limits and, therefore, cannot be included in a determination that they do not and would not contain lead. We also note that, on July 17, 2009, the Commission voted 2-1 to deny a request to exclude crystal and glass beads, including rhinestones and cubic zirconium, from the lead content limits. The Commissioners' statements accompanying that decision can be found at:
http://www.cpsc.gov/about/cpsia/sectl01.html#statements. page 28
Nothing in Dharma's letter refers to the CPSIA by name, nor lists the CPSC certified labs that did the testing. They refer to an old law that has been replaced by a much harsher law in calif Prop 65.