Gray Crazy Lace Agate 12 millimeter coins with 6, and 8 mm Gray Crazy Laze Agate and hematite is used in these stylish necklaces. The clasps are stainless steel. The necklaces come in multiple length: 16" - $30, 18" - $32, 20" - $34, 22" - $36, and 24" - $38.