Hallmark question| Diamond & ruby Pendant

by Sheryll
(Missoula, MT)

I have a pendant that is gold with rubies and diamonds and on the back it says 14k df. I was told by a local jeweler that these are the nicest diamonds and rubies they had ever seen - he said they were colorless. When trying to look this piece up, I cannot find anything online that looks close or even similar to it - do you know what it means or where I should look. Thanks!