Retro diamonds are basically fake diamonds.
Vintage refers to products that have an age to them. Retro are new products designed to elicit redolence of a bygone era. By definition, everything vintage is retro, but retro is not vintage.
Retro means "back," "backward," "behind." For example, the line "Vade retro!" translates to "Step back!" or "Go back!"
Retro cups are all the courses on the bottom row! (including: Leaf and lightning cup)
Backwards, or back in time.
A charity silver
He swam in the sea of diamonds
Ct stands for carat, the "weight" of the diamonds.
A retro pay deduction is an odd concept. It means that the company forgot to take out the deduction before, so they are correcting the error.
If you mean the channel, try Teletoon Retro.
CG is a term apparently associated with industrial diamonds, purposes for which about 75% of all mined diamonds are used.
Carats.
If you're talking about the "Battles", then Retro means the "older" version, it's exactly the same for how you play them, just with older tracks.