Set of 2 Crystal Rainbow Knife Rests in Sapphire. This set of 2 Swarovski Crystal Knife rests are part of the Crystal Decor line known as "Rainbow". The knife set comes with an option of 2 colors: Topaz and Sapphire. Each knife rest is approximately 4" (100mm) long, about 1.5" wide. Designed by Joel Desgrippes. Swarovski Crystal Rainbow Knife Rests Set Of 2 Sapphire 276698.