Maybe you’re looking to dress up the new door to your bedroom, bath, or study. Or maybe your old one could use a bit of bling. Either way, adding a glass knob is an easy upgrade. First introduced in the 1820s, glass doorknobs rose in popularity around World War I, when metals were in short supply. Today they’re back in style again, with choices ranging from jewel-toned beauties inspired by the Victorian era to clear orbs that date to the 1920s to colorful handblown pieces patterned after mid-century art glass. Just take your pick from these 20 gems.