Rings - Help identifying types of spiderweb turquoise

I recently purchased several vintage pieces including these rings. Any help in identifying mines/types of turquoise would be much appreciated. After researching several turquoise sites, I decide I know what one is, then I second guess myself. I love the spiderweb turquoise! Also, if anyone can shed light on the 3 artist marks pictured, it would be fantastic. Thanks so much.

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When you purchased the pieces did the seller give you what he believed the stones to be?

No. He did not give me any information on the stones. After studying images on several sites, I really think it’s going to be hard to identify specific mines. So many stones are so similar depending on the amount of matrix within individual pieces.

What a group. I am partial to almost completely black stones with blue speckles, so the topmost righthand stone is the one that attracts me the most.

I believe that first mark is Lorenzo Tortalita. I have a bracelet by him and the mark is the same.

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That’s him according to Hougart as well


https://bit.ly/2G18Bkg

"About the Artist Lorenzo Tortalita (LT, bear paw, hand, circle, shield)
(1925-1998) This Santo Domingo jeweler demonstrated making jewelry at Packard’s on the Plaza in Santa Fe, New Mexico.

Toralita created silver jewelry, weavings, worked in leather as well as beadwork.

Nearly every book covering American Indian jewelry references this artist.

His stamps vary from LT to the use of a bear paw, a hand, a circle or a shield."