It means that there are multiple diamonds involved that make a total carat weight (ctw) of .17 carats.
I assume you mean deck not decks? But that would be 1 queen of diamonds per standard 52 deck of cards.
You need a lot more information on the rating scale being used.
There are five main considerations or categories that affect the rating of a diamond. These categories are as follows: size, number, position, nature, and color/relief.
Steel Radial Speed Rating
That is what AAA (Triple a) has rated the hotel.
Diamonds are listed on the Mohs Scale of hardness, and occupy the hardest rating at 10.
cz rating ? well i do know that there are different quality cz's that rate in quality,such as would be for diamonds.
Hearts and Diamonds - 1914 is rated/received certificates of: USA:TV-G (TV rating)
Retro diamonds are basically fake diamonds.
Diamonds for Breakfast - 1968 is rated/received certificates of: USA:PG USA:M (original rating) West Germany:12
Looks like you have all the certified rating data you need in the question, except the quality of the cut of the diamonds, which by definition can be different in the two individual diamonds. You also apparently have the 'rating' of the settings.
Diamonds - 1999 is rated/received certificates of: Germany:12 (w) Iceland:12 Malaysia:U Singapore:PG Spain:13 UK:15 USA:R (original rating) USA:PG-13 (re-rating on appeal)
A charity silver
He swam in the sea of diamonds
Ct stands for carat, the "weight" of the diamonds.
Diamonds - 1975 is rated/received certificates of: Finland:K-12 Iceland:L Netherlands:12 Norway:16 Norway:12 (original rating) Sweden:11 UK:A (original theatrical version) UK:PG (video rating) USA:PG