Joomi Lim / Linn Lømo / Lok'd Jewelry
While New York's Joomi Lim is known for her cool spin on spikes and pearls, I especially love the screw detail on the underside of each spike. (Phillips head is always a fine choice when it comes to jewellery, though a Torx would work nicely, too.)
Also designing with spikes and pearls (of metal) is Norway's Linn Lømo, who made the rings above (including that terrifying gaping-beak bird!).
Even more jewellery: