This purple gold is extremely well known in that part of the world.
I think it was invented at Singapore Polytechnic and then licensed to
Aspal from what I read.
According to a 2002 Gulf News article:
"The man who holds the credit for its invention is Loh Peng
Chum of Singapore. He derived this shade of royalty by putting
the yellow garish metal to the ultimate test, at 10000C
through a sophisticated manufacturing process known as plasma
vacuum pressure. The final product is composed of 80 per cent
gold and 20 per cent precious metals. Purple gold has been
patented under "jewellery alloy compositions" and also has been
approved by the World Gold Council."