Coloque assim...
<?xml version="1.0" encoding="UTF-8"?>
<npc name="Hanna" script="data/npc/scripts/default.lua" walkinterval="2000" floorchange="0">
<health now="100" max="100"/>
<look type="136" head="113" body="65" legs="0" feet="96" addons="2"/>
<parameters>
<parameter key="message_greet" value="Bem vindo, |PLAYERNAME|. O que voce precisa? Eu tenho varios tipos de gemas e joias, diga {trade}."/>
<parameter key="message_farewell" value="Tchau."/>
<parameter key="module_shop" value="1"/>
<parameter key="shop_sellable" value="black pearl,2144,280;small amethyst,2150,200;small diamond,2145,300;small emerald,2149,250;small ruby,2147,250;small sapphire,2146,250;white pearl,2143,160;brown pearl,7633,3000;blue pearl,7632,3000;" />
</parameters>
</npc>
se ela é vendedoria seria:
<?xml version="1.0" encoding="UTF-8"?>
<npc name="Hanna" script="data/npc/scripts/default.lua" walkinterval="2000" floorchange="0">
<health now="100" max="100"/>
<look type="136" head="113" body="65" legs="0" feet="96" addons="2"/>
<parameters>
<parameter key="message_greet" value="Bem vindo, |PLAYERNAME|. O que voce precisa? Eu tenho varios tipos de gemas e joias, diga {trade}."/>
<parameter key="message_farewell" value="Tchau."/>
<parameter key="module_shop" value="1"/>
<parameter key="shop_buyable" value="black pearl,2144,280;small amethyst,2150,200;small diamond,2145,300;small emerald,2149,250;small ruby,2147,250;small sapphire,2146,250;white pearl,2143,160;brown pearl,7633,3000;blue pearl,7632,3000;" />
</parameters>
</npc>
Bom... use um dos dois