Section 234. Quality; contents

There shall not be applied to any article
  any  quality  mark  nor  any  colorable  imitation  thereof,   nor   any
  contraction thereof, nor any addition thereto, nor any words or letters,
  nor  any  mark  purporting  to be or resembling a quality mark except as
  follows:
    (a) An article consisting of at least 985/1000ths parts  of  platinum,
  iridium,  palladium,  ruthenium,  rhodium and/or osmium, where solder is
  not used and at least 950/1000ths parts of said metal  or  metals  where
  solder is used, may be marked "platinum," provided that the total of the
  aforementioned  metals  other than pure platinum shall amount to no more
  than 50/1000ths parts of the contents of the entire article.
    (b) An article consisting of at least 985/1000ths parts  of  platinum,
  iridium,  palladium,  ruthenium,  rhodium and/or osmium, where solder is
  not used and at least 950/1000ths parts of  the  said  metal  or  metals
  where  solder  is  used,  and provided further that at least 750/1000ths
  parts of said article are  pure  platinum,  may  be  marked  "platinum,"
  provided  immediately preceding the mark "platinum" there is the name or
  abbreviation as hereinafter  provided,  of  either  iridium,  palladium,
  ruthenium,   rhodium   and/or   osmium,   which   ever  of  said  metals
  predominates, and provided further that such predominating  other  metal
  must be more than 50/1000ths parts of the entire article.
    (c)  An  article consisting of at least 985/1000ths parts of platinum,
  iridium, palladium, ruthenium, rhodium and/or osmium,  where  solder  is
  not  used  and at least 950/1000ths parts of said metals where solder is
  used, provided more than 500/1000ths parts of said  article  consist  of
  pure  platinum,  may  be  marked with the word "platinum," provided that
  said  word  is  immediately  preceded   by   a   decimal   fraction   in
  one-thousandths  showing  the  platinum  content  in  proportion  to the
  content of the entire article,  and  further  provided  that  said  mark
  "platinum" be followed by the name or abbreviation as herein allowed, of
  such  one  or  more of the following metals, to wit: iridium, palladium,
  ruthenium, rhodium and/or osmium, that may be present in the article  in
  quantity  of  more than 50/1000ths parts of the entire article. The name
  of such other metal or metals other than platinum, however,  shall  each
  be immediately preceded by a decimal fraction in one-thousandths showing
  the  content  of  such other metal or metals in proportion to the entire
  article, as for example, 600 plat., 350 pall., or 500 plat., 200  pall.,
  150 ruth., 100 rhod.
    (d)  An  article  consisting  of  950/1000ths  parts  of the following
  metals: platinum, iridium, palladium, ruthenium, rhodium, and/or  osmium
  with  less  than  500/1000ths  parts of the entire article consisting of
  pure  platinum,  may  be  marked  with  the  name  iridium,   palladium,
  ruthenium,  rhodium  and/or  osmium,  whichever predominates in the said
  article but in no event with the  mark  "platinum,"  provided,  however,
  that  the  quantity of such metal other than platinum so marked, must be
  marked in decimal thousandths, and provided further  that  the  name  of
  such  metal  other  than  platinum  so  used must be spelled out in full
  irrespective of any other provisions of this article to the contrary.
    (e) An article composed of platinum and gold which resembles,  appears
  or  purports  to  be  platinum,  may be marked with a karat mark and the
  platinum mark, provided:
    1. The platinum in such article shall be at  least  985/1000ths  parts
  pure platinum; and
    2.  The  fineness  of  the  gold  in  such  article shall be correctly
  described by the karat mark of said gold; and
    3. The percentage of platinum in such article shall be  no  less  than
  five per centum in weight of the total weight of the article; and

    4.  The mark shall be so applied that the karat mark shall immediately
  precede the platinum mark, as for example, "14  K & Plat.",  "18  K  &
  Plat.", as the case may be, it being expressly provided that in case the
  percentage  of  platinum exceeds the five percentum provided herein, the
  quality  mark  may  also  include  a  declaration  of  the percentage of
  platinum, as for example, "18 K&1/10th Plat.", or "14 K& 1/8  Plat."
  or as the case may be.
    (f)  An  article  composed of platinum and any other material or metal
  not resembling, appearing or purporting to be platinum,  may  be  marked
  with  the  quality  mark platinum provided all parts or portions of such
  article resembling  or  appearing  or  purporting  to  be  platinum,  or
  reasonably  purporting to be described as platinum by said quality mark,
  shall be at least 985/1000ths parts pure platinum.