I'm pleased to offer an Amy Lacombe Handmade Abstract Iridescent Pin Brooch. It has a Crystal that looks like quartz and is Signed. Other similar ones that look like this are listed as Vintage 1980s.

Here's what else I found by looking at similar listings:  "Early Amy Lacombe Brooch Pin Extra Large XL  Los Angeles Handmade Modernist 3D Dimensional Porcelain Crystal Unique Biomorphic Statement Wearable Abstract

Marked with sticker Lancombe. 

About Amy Lacombe:

Amy began her career in 1984 by designing hand-made fashion jewelry that was sold through major department stores and catalogs. Her inspiration comes from her husband, two children, four dogs, two cats and nature. She says, "I love people, animals, and color. I'm grateful to be able to express this through my art. I hope it brightens your day." Her jewelry is greatly sought after, as Amy no longer creates jewelry and instead focuses on her Whimsiclay line of imaginative animal themed ceramic figurines. Her jewelry line is retired and jewelry items are no longer in production."

Measures approx. 3.0" x 3.75”
Condition: Vintage, pre-owned

Some of the spaghetti string looking designs seem to end abruptly, so it is possible that a few of them have chipped off a bit (but I'm not certain how they were orignially designed). Please see closeup photos.

Thanks for looking!