There are a total of 10 Precious Stones in Assassin's Creed Liberation HD. Finding all of them is required for the "Persona Collector" trophy / achievement. You will also unlock a special costume for the lady persona.
To check how many you have already found, go to "Inventory" - "Items" in the pause menu. There they are listed as Jeweled Brooches. All of them are located in New Orleans and can be acquired by charming certain men.
Only the lady persona can pick up these specific collectibles! Since the lady cannot climb, you will sometimes have to use ladders to get on rooftops and then drop nop to your target.
To unlock the Persona Collector trophy / achievement you must also find the Assassin Coins and Voodoo Dolls.
Assassin Coins
http://www.power-pixel.net/t56414-
Voodoo Dolls
http://www.power-pixel.net/t56415-
TIMELINE:
#1 - New Orleans - 0:05
#2 - New Orleans - 0:50
#3 - New Orleans - 1:18
#4 - New Orleans - 1:45
#5 - New Orleans - 2:18
#6 - New Orleans - 2:45
#7 - New Orleans - 3:19
#8 - New Orleans - 3:59
#9 - New Orleans - 4:28
#10 - New Orleans - 4:55
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