A Tiffany mount or Tiffany setting is a set of prongs (called a claw, crown, or coronet) that hold a gemstone

Gemstone

A gemstone or gem is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments...

 and attach it to a plain band ring. It is the most common setting for a diamond solitaire engagement ring

Engagement ring

An engagement ring is a ring indicating that the person wearing it is engaged to be married, especially in Western cultures. In the United Kingdom, Ireland and North America, engagement rings are traditionally worn only by women, and rings can feature diamonds or other gemstones. In other cultures...

. It is named after Tiffany & Co.

Tiffany & Co.

Tiffany & Co. is an American jewelry and silverware company. As part of its branding, the company is strongly associated with its Tiffany Blue , which is a registered trademark.- History :...

, which popularized it.

It is inexpensive and easy to re-use, so most jewelers will accept returns of this setting and re-set the diamond in a different ring more to the bride-to-be's liking. (This is most often done just before getting married, to move the diamond into a wedding set of wedding band and engagement ring that are matched and often locked together.)

The Tiffany mount also shows off the diamond and may maximize its radiance. Quality settings do not snag on clothing, as the prongs are firmly attached to the diamond and well finished.