Some diamond producers engrave stones so as to make each stone more uniquely identifiable.
The engraving should have documentation with it that details who engraved it and where the engraved data is stored.
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It's always a good idea to have your diamond jewelery -- or any jewelry worn often set with precious stones -- inspected (checked) by a jeweler regularly, who can tighten, replace or re-mount stones so they are not lost.
The initials dwt may mean diamond weight total. In this case 6.80 is the weight measurement, in carats. The total weight is made up of several stones.
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 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.
CTW or TCW expands to read carat total weight or total carat weight.In dealing with gemstones, when multiple stones are mounted in jewelry, the total carat weight of the combination of stones is advertised.A single gemstone of the same weight as the CTW or TCW of several stones will always be more expensive.
Get physical. Use stones, coins, wooden blocks. 5 rows, 3 stones in each row, equals 15 stones. 5 x 3 = 15. And so on.