I found this in an article - it also gives a contact email at the bottom:
To address certain aspects of the new law, the CPSC recently published a guidance for small businesses, resellers, crafters and charities.5his guidance addresses a series of topics such as FAQs on definitions, timetable for compliance and testing, exemptions / exclusions, and commonly resold children's products and materials. Highlights of a number of these concerns are summarized below.
The following materials or components can be used (separately or in combination) and sold provided they have not been treated or altered or undergone any processing that could result in the addition of lead:-
1) Precious gemstones: diamond, ruby, sapphire or emeralds
2) Semi-precious stones provided that the mineral or material is not based on lead and is not associated with any mineral based on lead
3) Natural or cultured pearls
4) Wood
5) Other natural materials including coral, amber, feathers, fur, and untreated leather
6) Surgical steel
7) Gold of least 10 karats
8) Silver of at least 925/1000
9) Platinum, palladium, rhodium, osmium, iridium and ruthenium
10) Yarn (dyed or undyed)
11) Dyed or undyed textiles (cotton, wool, hemp, nylon, etc) including children's fabric products such as baby blankets, and non-metallic thread and trim. This does not include products that have rhinestones or other ornaments that may contain lead or have fasteners with possible lead content such as buttons, metal snaps, zippers or grommets.
12) Children's books printed after 1985 that are conventionally printed and intended to be read, as opposed to used for play
13) Certain educational materials such as chemistry sets
For enquires, please contact us at mktg.hk@sgs.com or visit www.hk.sgs.com/safeguards