Product description based on custom field values

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.24

I'm trying to switch parts of a product's description based on values of that product's custom fields. I have the Nonumber Sourcerer extension to help place php in the product description. I have been able to get Sourcerer to do simple echo's and some other stuff. I can't get it to retrieve the custom field's value though. I'm still learning php and very new to Hikashop, so I'm sure it's my php code. The code I currently have is:

{source}
[[?php
$fieldClass = hikashop_get('class.field');
$fieldClass = $fieldClass->getField('headstamp','product');
echo $fieldClass->field_value[value];
?]]
{/source}

Thanks. After looking at the views I see where I can add in what I need dependent on my custom fields.