Le Vian Chocolate Diamonds are brown diamonds, which are the the most common type of diamond. As of 2014, Le Vian Chocolate Diamond rings range in price from $1,300 to $8,000, depending on carat weight and retailer. Le Vian calls these brown diamonds "chocolate" as part of a marketing effort to increase the popularity of these colored gems.
Le Vian Chocolate Diamonds are available at major American jewelry retailers, as of 2014. They are branded as having different flavors as Le Vian also calls itself a "chocolatier," producing rings and other jewelry made from "chocolate diamonds" set in "vanilla gold."
The diamonds primarily come from the Argyle Diamond Mine in western Australia. Black diamonds are also sometimes called "chocolate diamonds," but black diamonds are more rare than brown.