Our pendants are 925 silver and generally hallmarked. We offer a range of chain lengths, 16"-22", on all except those which have a chain permanently attached. In these cases we offer the option to buy a necklace extender, which you can use on any similar necklace. These come in 2" and 4" lengths, and we charge just $2 or $3 to cover our cost. We make no additional charges for choosing different length chains.