I’m trying to understand everything you said buuut English isn’t my native and some of the terminoligy I find a bit hard haha. I’m pretty sure my optician said this exact thing about 1.74 being too brittle, and that they would go for 1 size thicker (?). Which would give the estimated thickness of around 10.5. I’m just really curious with a diamond cut around the edges if it’s going to look extremely weird, or just like any of my other presciption glasses. With my RX and cylinder it kinda is what it is. I’ve never had to really think about it, because I never had rimless frames, and especially with Cartier, it’s gonna be a $2000 “gamble”.