Personally it bugs the heck out of me when any type of shop refers to a metal item as just silver, gold or platinum. Legally they're not allow to do that on any stand alone portion of their advertising even if it is later described in another portion correctly. I know they really should be reported to the FTC and / or the BBB for fraud but I just skip over them & figure karma will eventfully catch up with them through negative feedback.
Under the FTC regulations it is a chargable offense to mislead a customer into thinking a piece is fine metal. If someone are refering to metals they really need to clarify the quality of the metal grade by using descriptors, because even the government deems that the use of the words platinum, gold, or silver alone refers back to the fact the item is composed of a certain purity of the alloy.
From
http://www.ftc.gov/bcp/guides/jewel-gd.shtm ...
"(b) The following are examples of markings or descriptions that may be misleading:
(1) Use of the word "Platinum" or any abbreviation, without qualification, to describe all or part of an industry product that is not composed throughout of 950 parts per thousand pure Platinum." ....
"b) The following are examples of markings or descriptions that may be misleading:
(1) Use of the word "Gold" or any abbreviation, without qualification, to describe all or part of an industry product, which is not composed throughout of fine (24 karat) gold." ....
"(b) It is unfair or deceptive to mark, describe, or otherwise represent all or part of an industry product as "silver," "solid silver," "Sterling Silver," "Sterling," or the abbreviation "Ster." unless it is at least 925/1,000ths pure silver."