Purity Ring’s music feels precious to me. When I say “precious” I don’t mean it the way some people describe things that are overly cutesy or twee. I mean that the electro-indie duo, comprised of Megan James and Corin Roddick, treat their music as if it is precious. I don’t say this just because of the band’s slow and careful songwriting process. Each song feels to me like a cut jewel, sharp, precise, bright, and clear, to be handled with care and awe. Or at least that is how I felt when I saw Purity Ring play at House of Blues on Wednesday.