3D-printed engagement rings – the future of jewellery?

No, it’s not a substitute for the real thing, but an opportunity to see what a diamond might look like before the genuine one is made. Good idea?

Moog goes back to the future with re-issues of classic synthesisers

US company plans to hand-build a limited run of three large-format synthesisers first released in 1973 – with price tags ranging from $10,000 to $35,000

Sales of printed books fall by more than £150m in five years

New figures from Nielsen BookScan show continuing decline since 2009 as more and more readers migrate to ebooks

Mobile trends for 2015

From startups taking on giants to mobilising revenue-generating processes, our panel predicts the talking points for next year

From Kardashian to couture: how Balmain got its 21st-century buzz

Olivier Rousteing, the fashion house’s 28-year-old creative director, explains why he’s obsessed with social media and star power

2015 gears up to be the year of wearable tech

Apple Watch forecast to deliver spring boost to sales
Could 2015 be the year wearable tech becomes sexy?