Shikon no Tama keychain

The Shikon no Tama keychain is seen in Episode 1. Kagome's grandfather hands her one and starts talking about the Shikon Jewel, but when he looks up, Kagome is using the keychain to play with Buyo, their cat. As a plastic replica it has no power, whatsoever, of the real Shikon no Tama. While the Shikon no Tama keychain is roughly the same size as the real Shikon no Tama, as well as having the same shape, none of the keychains were seen to have the same color as the real Shikon no Tama.