what is a t.w diamond
TW is an abbreviation that denotes the total  weight of a diamond. Carat is the term to describe the weight of  any gemstone or a diamond. In jewellery pieces with more than â¦ one  diamond the carats may be described in terms of total carat weight.  This is the combined total carat weight of all the stones in the  piece.
Confidence votes 263. The phrase carat TW means the carat total weight. This implies there may be multiple diamonds involved in the piece of jewelry and when they are all added together, one-tenth of a carat is their combined weight. Carat is just a diamond industry special word for weight of a diamond stone.