Identify hallmark and turquoise

Hi! I recently inherited my grandmother’s turquoise jewelry and I can’t seem to identify the mark on the backs of her clip-on earrings. My dad seems to think she picked them up in Texas or Arizona, as she use to live there. I think the stone is Easter Blue, but not quite sure. Hallmark is an arrow with a double SS towards the arrow tip.

Thanks in advance.

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Thanks for sharing. The stone could definitely be a piece of Easter Blue Turquoise. The hallmark is attributed to Sherry Sandoval in Hougart’s book. Hope this helps and enjoy wearing those beauties.