What are the applications of the white gold?

Answer 1

White gold was sought and discovered by goldsmiths who required a cheaper alternative to platinum in jewellery. http://www.gold.org/discover/sci_indu/GTech/1999_25/White.pdf

For good technical and economic reasons, the term ‘white’ has been used to define a wide range of color So, standards have been developed where "White Gold" has been defined as having a Yellowness Index value of 32.0 or less. There are three grade of white gold, bassed solely on color .
GRADE 1 (Premium white grade) – good white color and do not need rhodium plating.
GRADE 2 (Standard grade) – reasonable white color; rhodium plating is optional
GRADE 3 (Off-white colour) – need to be rhodium plated
http://www.gold.org/jewellery/technology/colours/white_guide.html

Answer 2

White gold is an alloy of gold and at least one white metal, such as silver or palladium. Like yellow gold, white gold is measured in karats.

Its properties vary depending on the metals and proportions used. As a result, white gold alloys can be used for different purposes; while a nickel alloy is hard, strong and therefore good for rings and pins, white gold-palladium alloys are soft, pliable and good for white gold gemstone settings. The highest quality white gold is usually at least 17 karat, and made up of gold and palladium, and sometimes even trace levels of platinum for weight and durability, although this often requires specialised goldsmiths.
While some higher quality white gold alloys retain their shine and lustre, most will be coated with a very thin layer of rhodium. This will give the naturally more dull white gold a shine comparable to platinum or silver. Often white gold will require cleaning, or re-coating of rhodium at a later date.

"White Gold" is also a common nickname for asbestos....

Answer 3

Mainly jewelry. White gold is gold with certain metals alloyed to give it the non-yellow color.