Sue--stabilized turquoise is when they use a resin epoxy in the cracks of the stone, which makes the color "stable" (vs natural turquoise, which darkens over time in contact with the skin). It's cheaper than natural stone, and reconstituted (where they mix cheap turquoise with the resin and process it) is even cheaper.
If there are no hallmarks on this, though (ie if it's silvertone base metal), chances are it has a very inexpensive (stabilized or reconstituted) stone, and it could also be glass.
Here's a link to a good info page on turquoise:
http://www.collectorsguide.com/fa/fa098.shtml
If the other pieces aren't marked and are ca 60s, they're base metal, too, and the "sapphire" in the heart brooch likely a rhinestone. "Goldtone September RS Birthstone Heart Lapel or Scatter Pin"?
The veggies in the horse's cart look vaguely late summer/autumnal to me--ie gourds, tomatoes? "Novelty Figural Horse & Vegetable Cart Silvertone Brooch"?
I'm not great on KW, but that's hopefully a start!