Hallmark identification on turquoise necklace

Identifying & Discovering
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1

Hi everyone, thank you for the replies to my previous post. I was wondering whether anybody could help me identify the hallmark on this necklace?
I was wondering what kind of turquoise this could be?
I also noticed the chain is stamped PT and 925 what could this mean?
Thanks :))

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Nice pendant but Iā€™m no help with the mark. The chain is sterling. The PT is likely the manufacturer. Platinum would have been PLAT or PT with the purity, usually .950 or .900.

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3

This pale blue stone could be Dry Creek.

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4

.925 is Sterling. PT looks like an origin stamp. Portugal.

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5

no mark in the book and this is the closest i could find so far

ndi
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