Antique Metzler manufacturing company Ruby ring Lab created These stones are the most wonderful, mesmerizing, saturated shade of hot pink or magenta, depending on how you like to describe this incredible color. MM jewels, as the hallmark says, are beloved for their style and quality-- so collectible! This ring is in a wonderful cruciform shape with 7 stunning stones. These test as rubies on my Presidium tester, and are likely synthetic as was all the rage in the 1920s and 1930s. The color of the gems is just fantastic. The setting is 10K gold.