About any jewelry maker that cast or sales jewelry can do this simple job. It takes only a plater or dipping and electric current.
The convert yellow to white gold depending of the piece if it is small or big can cost from $60 thru $200 every 6 mo. thru year; but it is much better to buy pure solid white gold in this day's.
It can be Gold or Silver plated yes but will not increase the value
The yellow gold dipped with Rhodium plated it is not white gold ... It is alloys of yellow gold with Rhodium plated... Only "Pure Solid White Gold formula" it is the real white gold inside and outside white; Life time guaranties!
it means that its not solid gold its plated or dipped in gold
I assume you are asking this for one of two reasons. First, because you have a yellow gold ring that you would like to make into a white gold ring. The answer to that is, no, you really can't do that. Liquid gold is molten, meaning that it is heated to a high enough temperature that it melts. Dipping a ring into molten gold would make it melt, too. Maybe not completely melt down into a puddle, but you would certainly lose any detail in the ring's design. The second reason you might be asking is because you have a "white gold" ring that has a golden yellow core, like yellow gold that has been dipped into white gold. This, unfortunately, is merely a brass ring (the yellow part) that has been plated with a white metal, perhaps white gold, but more likely some kind of whitish silvery base metal.
White gold
The symbols S51 on a 14k white gold ring illustrate the purity of the gold.
No, white gold is not magnetic so a white gold ring will not stick to a magnet. It is composed of gold, alloyed with white metals like nickel or palladium, which are not magnetic.
Yes can be white Gold hallmark in gold metal alloys Ring.
White gold can appear to turn yellow over time due to the rhodium plating wearing off, revealing the natural yellowish color of the underlying gold alloy. To restore the white color, the jewelry can be re-plated with rhodium by a professional jeweler.
Two tone engagement rings are made by using both white and yellow gold in the design. One part of the ring will be yellow, another white. The two colors are specifically dipped and set.
You can get a white gold engagement ring at many online and high street retailers. The biggest misconception about white gold is that it is primarily made of yellow gold.