My girlfriend and I have been shopping around for a ring, we have settled on a Gelin & Abaci TR-173 tension setting. Yesterday we went to a large chain store (great for window shopping ya know?) and found the exact ring, she tried it on, we conversed with the salesperson and so forth. After talking awhile she tells us that Gelin & Abaci will mount only Diamonds in there settings. She said they won''t mount a Ruby/Topaz/other fake stone not to be metioned here. She cited that they are not "hard enough" and "will only cause you problems". Is this B.S. or am i really unable to mount a Ruby/Topaz in a Gelin & Abaci tension setting?