1970's Amythyst amd white gold necklace plus glass brooch

The necklace was given to mum in 1972 by my father for a weddong anniversary
.It was very modern at the time and I don't remember mum wearing it much at the time.I do remember her wearing after dad passed away in 1977.
I have had it since mums passing in 1987.I have worn it lots as it is an ageless piee and somehow makes me closer to mum.I bought amythyst earrings to match and last week found this great brooch.I can not see any stamps and feel its costume but lovely neverless.