These two Leklai is by Luang Phor Somphon. (Ajahn Yai).
Leklai always has a mystic power. It is believe that a Deva has resident in it.
Gold Leklai is more for wealth whereas Purple Leklai is more on health.
To pray to Leklai one has to offer honey to it. Leklai is not cut or extract from stone cave. It is thru recite of prayers and offer of honey for Leklai to drop from the top of the cave. Only good master able to ask for Leklai. Not all cave has Leklai. The cave must be previously resident by high monks or Lersi. Only then Leklai is form in the cave.
It is believed only the master perform high merit then able to get Gold/Silver Leklai.
The Leklai also in the form of Luang Phor Thuad (Good in Protection esp. prevent fatal car accident). However, given a closer look it look like Luang Phor Ngern (Good in business / sales) instead more of a form of Luang Phor Thuad.