Juliet from Serene collection
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traditional clear glass knob, restoration hardware https://smile.amazon.com/Elements-424PC-Collection-Geometric-Polished/dp/B00CPT1RZ6/ref=sr_1_14?ie=UTF8&qid=1545872475&sr=8-14&keywords=hexagon+knob+chrome
Devon Kingsbridge Top knobs
Brushed nickel knob from CB2 or see Lambeth hexagonal knob from Restoration Hardware in chrome
Emtek art deco knob
Nicole bar pull by Alno, various sizes
Juliet from Serene collection
Q