24k wears like 18k

I saw a company that advertises a 24k gold that has durability of
18k and has the color of 24k. It said because of its micro
crystalline structure it can be worked with and even cast. It is
made in Japan an is sold by a company in California called" Pure
Gold". Sounds really neat. Has anyone ever seen or used this
material? Thanks: Michael Chapman {Kansas-mid USA}