Unusual Vintage Antique Marked Ring Copper Gold Vermeil Gemstone Tests Quartz Range fashion

Unusual Vintage Antique Ring is Marked with a Mark I can't make out. The Ring Looks like Rose Gold, but I believe it's Copper with fashion a Gold Vermeil. The Oval Gemstone Tests in the Quartz Range, but does have some pitting on the flat back that made me wonder if it could be Jade. I also noted a brown inclusion in the back.

Ring is a Size 9.75 and is not adjustable, and the Face of the Ring Measures approximately 3/4" Tall and 1/2" Wide.

Condition is Very Good with No Flaws and Light Wear or Aging.