total weight of the stone like if it says .25 total weight that is a quarter caret.
About the Weinberg surname. The Weinberg name appears among Jews of East Europe in various locations. It is from the German word for vineyard. In the 18th and 19th century, government clerks began assigning family names to Jews ( and others), often based on occupation, location, or prestige.
There are names that hint at their original bearer's personality: Abulafia (big man), Gutman (good man), Altman (old man). There are some that are even an anagram of an earlier family name; the name Weil in Hebrew (vov-yud-lamed)is an anagram of Levi (lamed-vav-yud).