Silvers are much easier to find locally. That being said, jades colour up much more nicely. Out of curiosity, where would you be getting the jades from? I only ask because they are not easy to get in Sydney or NSW for that matter - believe it or not despite being native, in NSW they are considered noxious - just like redclaw crays and sleepy cod.
haha thanks guys for all the support this is my first big project its hard getting the money as im only 15 and have a minamum pay job but its starting to pay off and im not that worried about the jar jumping but there wil be a screen like tent think on top just to be safe