What is Rose Gold?

Most jewelry buyers are familiar only with the traditional "White" or "Yellow" Gold.  However, Gold actually is produced in a number of colors.  To achieve the different possible colors of Gold, pure Gold is alloyed with different metals.

Let's take, for example, Red, Rose, or Pink Gold.  Here some historical background, and the percentages of Gold alloyed with different metals to achieve these colors:

Rose Gold is a Gold–Copper alloy widely used for specialized jewelry. Rose Gold, also known as Pink Gold and Red Gold, was popular in Russia at the beginning of the nineteenth century, and was also known as Russian Gold, although this term is now obsolete. Rose Gold jewelry is becoming more popular in the 21st Century, and is commonly used for wedding rings, bracelets, and other jewelry.
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Although the names are often used interchangeably, the difference between Red, Rose, and Pink Gold is the Copper content: the higher the Copper content, the stronger the red coloration. Pink gold uses the least Copper, followed by Rose gold, with Red Gold having the highest Copper content. Examples of the common alloys for 18K Rose Gold, 18K Red Gold, 18K Pink Gold, and 12K Red Gold include:

• 18K Red Gold: 75% Gold, 25% Copper
• 18K Rose Gold: 75% Gold, 22.25% Copper, 2.75% Silver
• 18K Pink Gold: 75% Gold, 20% Copper, 5% Silver
• 12K Red Gold: 50% Gold and 50% Copper

In this image nine different colors of gold are shown from Green to Grey.

You can read more about the different colors of Gold at this link.  Wikipedia Article on Colored Gold.