I'd like to make a lariat necklace with a single strand of sterling silver chain and large, chunky gem/carved beads at the ends. How do I choose which chain to use? Can 2.3mm flat figure 8 chain or 2mm rolo chain support the weight, or will I risk breakage? Also, I wanted to use Swarovski, but thought a gemstone of at least 7 on the Mohs scale might be safer. What do you suggest? (I tend to knock opera-length necklaces into desks and tables when I scoot my chair in.) I've lost a number of charms this way. Thanks for suggesting sturdy gems and silver chains for me!