Ruby is an incredibly durable gemstone if there are no treatment-related durability concerns. - Courtesy Jan Goodman Co. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale.

X-Men '97 (Photo: Marvel Animation), Star Wars: Skeleton Crew (Photo: Matt Kennedy/Lucasfilm Ltd.), Doctor Who (Photo: BBC America/Disney+) Thanks to a growing roster of shows from Marvel (your ...