The type of rod and finial you chose to hang your drapery from can make or break the final visual outcome. The dimension of the rod should be big enough to balance the overall height of the ceiling. for example, a 1″ diameter rod will look unbalanced in terms of scale hanging in a room with a ceiling that is higher than 8′-0″ high.
An analogy that is sometimes used for cabinetry hardware applies to the drapery rod finials; the finials are like the jewelry for your window treatments. Like so many design choices, the options for finials are massive. Here is a picture of two final designs S Interior Design is using in a project currently. They will be going on operable drapery that will be in two separate rooms. The rods are 1 3/4″ in diameter, and the ceiling height is 10′-0″. The finials themselves are 5″wide x 5″high and 7 1/2″ wide by 5″high respectively.
Take a look at a video showing a professional doing a measurement for the spaces these lovely finials will finally be used. All 140 yards of fabric that will be used were ordered today!
S Interior Design- Scottsdale, Arizona Blog 
These are some great tips for hanging window coverings. I came across your post this afternoon while browsing interior design blogs and the topic of window treatment selection was very interesting to me. It is true that you must dress your windows appropriately to bring out their true beauty. Thank you for writing and as a special thanks to you and your readers, I would like to offer a 20% off coupon using this code upon checkout: BLG20.
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