Were Costume Necklaces and Earrings of 'Grapes' a "thing/fad"?

After my mother passed in March of this year, as the only daughter I inherited all of hers and her Mother's jewelry. There is a bit of fine jewelry, albeit, inexpensive fine jewelry but more fascinating is the large amount of costume jewelry. 90% of the costume jewelry belonged to my Grandmother.

She was born in the early 1900's, so any amount of jewelry that would have been accumulated to my way of thinking/guessing from 1930's to 1970's (late). She died in the early 80's. She seemed to LOVE brooches, Canadian Maple leaves, etc. She also either was a fan of jewelry that looked like grapes or it was a fad at some point.

Here are some of the 'infamous' grapes as we are calling them. Two necklaces, one with all of the grapes a goldish color and the other with white and gold tones. One set of earrings is a match to the gold and white grape necklace. My main curiosity here is wanting to know if these were from a specific 'fad' time...the rest of me is amused :)