An Illusion Rectangular Shape Emerald Cut Diamond Necklace refers to a necklace that features a series of diamonds that create the illusion of emerald cut set into a rectangular shape . The term "illusion" suggests that the setting of the diamond creates an optical illusion, making it appear larger than its actual size.

The necklace is made of 14K gold, a popular choice for jewelry due to its balance of beauty and affordability.

Overall, an Illusion Rectangular Shape Emerald Cut Diamond Necklace would make an elegant and sophisticated piece of jewelry.