NEW YORK (CNN/Money) - Four toy jewelry importers have recalled 150 million pieces of toy jewelry sold in vending machines across America due to dangerous levels of lead.

Necklaces that are among the 150 million pieces of toy jewelry being recalled.

A statement from the Consumer Product Safety Commission said Thursday that only about half of the 150 million pieces of toy jewelry actually contain lead. But, because it is difficult to distinguish the lead jewelry from the non-lead jewelry, all of it is being recalled.

The CPSC said it received one report of lead poisoning when a child swallowed a piece of previously recalled toy jewelry containing lead. The commission said young children sometimes mouth or swallow items like these, and lead can leach from the jewelry into the child's body.

Lead poisoning in children is associated with behavioral problems, learning disabilities, hearing problems and growth retardation, according to the commission.

This toy jewelry recall involves various styles of rings, necklaces and bracelets. The jewelry was sold in vending machines for between 25 and 75 cents in malls, discount, department and grocery stores nationwide from January 2002 through June 2004.

These dollar sign necklaces are among the toys being recalled.

All the jewelry was manufactured in India. Parents are advised to look through their children's toys and throw out any of the jewelry they find. (Click here for CPSC photographs of recalled jewelry).

The rings are gold- or silver-colored with different designs and paint finishes with various shaped center stones. The necklaces have black cord or rope or gold- or silver-colored chains. The necklaces have pendants, crosses or various geometrical designs or shapes, and can include gemstones.

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The various styles of bracelets include charm bracelets, bracelets with medallion links, and bracelets with faux stones.

The four companies selling the toy jewelry are A & A Global Industries, Inc., of Cockeysville, Md.; Brand Imports, LLC, of Scottsdale, Ariz.; Cardinal Distributing Co. Inc., of Baltimore; and L. M. Becker & Co., Inc., of Kimberly, Wis.