I'd appreciate help with these earrings

[AC]

It is just plastic resin with dyes. Here is something about it from Bigbree43

Block turquoise chart

I found this chart depicting all kinds of block turquoise available to purchase. Always be aware of what you are buying! I found that gently “tapping” the stone against my teeth is a good test that I can do on site (before purchasing) without damaging the stone. Genuine turquoise will sound like glass when gently tapped against your tooth. Block will sound like plastic. It sounds like a crazy thing to do, but I promise it works! Block turquoise, sometimes called synthetic turquoise, contains no…