Monogrammed Gold and Diamond Three Letter Necklace 1" Can you get any more classic than that. Here is our popular three letter design with the center letter in diamonds. This pendant measures 1 inches in diameter and is set with as many diamonds as we can fit into your center letter. This necklace is made from 10 karat solid gold. Please allow 2-3 weeks for us to custom design your necklace. This necklace will come in your choice of a 16 or 18 inch chain. Please choose from yellow gold, white gold or rose gold. The center letter that has the diamond inserted in it will be done in 10 karat white gold.