Actually, the 5520 - Graphic Crystals have more Facets than the 5203 - Polygons.

But because of the 2 dimentional shape of the the Graphic crystal, you will also see the facets on the back of the crystal through the front when you string it or hold it up to the light.

We do not recommend using Swarovski pearls on elastic cord because the crystal center can be rigid enough to cut through the cord.

However, we suggest using the Elonga elastic thread because it is made with several individual stretchy strands that will begin to fray before it breaks, unlike other elastic cords.

You can use the .7mm Elonga for your pearl bracelet:

http://www.artbeads.com/elong-07.html

The closest Swarovski color to Tiffany blue would be Turquoise, or Blue Zircon.

The Swarovski Blue Zircon or Indicolite blue as well as a Peridot or Chrysolite green will work with the Square Ring Bermuda Blue. We do offer a sample idea in the Learning Center called the Twisted Rainforest Necklace which we use Seed Beads to link the square rings together. To view this idea please follow the link below:
http://www.artbeads.com/000-kit0007.html

You can use Burgundy to match, but Black Diamond would look nice as a complementary contrast. I made earrings using small gray pearls and silver findings and they turned out really nice

i dont know about a toggle, I finish mine with the ribbon ends SS-ENDCAP02 or I knot it and use a spot of glue.