The gold used could be either yellow gold or rose gold or white gold (i.e.platinum).
The exclusive piece launched on 14th February, is one of the worlds costliest iPhone 6.
It is made of 24K Gold and also flecked with diamonds along its side and diamond studded Apple emblem.
The cost of this Diamond Ecstasy model is expected to be 2.3 million (i.e.
$3.5 million) and is suppose to be the most costliest luxury iPhone designed till date .
source: www.techworm.net