The price of a diamond necklace can vary widely depending on factors like diamond quality, carat weight, setting, and design. Simple diamond pendant necklaces can start around $1,200 CAD, while more elaborate designs with larger diamonds or intricate settings can range from $5,000 CAD to $50,000 CAD or more. For example, a classic solitaire diamond necklace may cost around $1200 CAD, while a statement piece like this diamond river necklace with multiple diamonds could be priced higher.