M & D International (Long Beach, CA)

M S International (Lafayette, CA)

Majesta M Collection (Huntington Beach, CA)

Mann Brothers & Co (Union City, CA)

Maple Ranch (Diamond Bar, CA)

Marin Crystal Company (San Rafael, CA) - aka Amethyst from Uruguay

Marin Mineral Society (San Rafael, CA)

Mark & Period Antique Jewelry (San Rafael, CA)

Mat Collection (McKinney, TX)

Merchant of Murano (San Diego, CA)

Mermaid Trading (San Francisco, CA)

Mineral Art in Silver (Heber City, UT)

Mineral Hunters (Lake Forest, CA)

Ming's Trading (San Francisco, CA)

Molly Jewelry (San Francisco, CA)

Moonlight Gems (Surprise, AZ)

My Beads & Gems (Bolingbrook, IL)

My Quang Jewelry (Westminster, CA)

Mythos Designs (La Jolla, CA)