I've never had a problem w/falling crystals on a RR jean (or any crystallized premium denim brand, for that matter). Some pairs say to dry clean only, but I've washed on gentle, turned inside out w/cold water, and it's been pristine.
You shouldn't put any of your premium denim in the dryer anyway as it will break down any lycra in the fabric. I would just wash them gently in cold and hang to dry.
Really? Is the end effect that it stretches out? Does it shrink back a bit the way it would after drying if you hang dry?
Sorry, kinda OT, I got my first R&Rs recently.
If you put the jean in a dryer, this is what happens to the fit/shape:
It could shrink its orig dimensions (MOST NOTABLY with inseam length). This is particularly important if you've hemmed the jean to its perfect inseam length, but because you put it in the dryer, the inseam could shrink up, and now you're left with an inseam that isn't ideal.
The waist/hip area may get affected in that they could be smaller, but with most premium denim out there, this effect is temporary. Once you wear the jean out, it'll stretch/conform to your body.
Does drying actually damage the jeans besides the issue of shrinkage? I wash/dry before hemming and rely on the dryer cycle to shrink my jeans back after they've stretched out from a few days of wear. I thought maybe you meant it would affect the life of the denim?
Oops, sorry, I didn't know your query was also re: jean damage in general.
Yes, if you regularly use the dryer every time you wash your jeans, you WILL notice that longevity will be affected. Of course, you won't notice this immediately, but prolonged exposure to heat/the dryer will damage the fibers.
loserxstar made a good point; if you wish to throw it in on low/no heat to get rid of that "crunchy" feeling when you line dry items, then that's MUCH better than running your jeans through med/high heat.
Additionally, as I had noted, the actual COLOR of the jean will be compromised. If you've ever washed and thrown cotton black t-shirts in the dryer, you'll know exactly what I'm referring to.
For me, if I'm paying that much for premium denim to begin with, I'd prefer to leave it as pristine as I can, and proper washing/drying comes w/that territory.