Turquoise custume ring

Big giant turquoise plastic ring from H&M and the circle ring from Picnic a boutique, for pretty cheap.

the-coveted

Costume ring

Fancy rings designed to keep up with current fashions trends, they are made of inexpensive materials and are reasonably cheap.

merriam-webster

Vintage costume rings

Halcoholic

L to R: green/gold vintage cocktail ring from Aci Nae, goldtone costume ring from estate sale, black jade ring