Put this BOTH under category ruleType="PickUp" AND under ruleType="Keep"
<ItemRule itemType="Amulet" description="Rare amulets">
<StatRules>
<Rule stat="Quality" value="Rare4" />
</StatRules>
</ItemRule>
<ItemRule itemType="Ring" description="Rare rings">
<StatRules>
<Rule stat="Quality" value="Rare4" />
</StatRules>
</ItemRule>