What I love about jewellery and adornment in general is that almost anything can qualify – different metals, materials, forms, uses. You can play it up with precious metals and jewels, or keep it simple.

Here, designer Ludevine opted to take the high road. This ring’s focal point is an ammonite, a mollusc shell from an extinct species. The fossil is set in 14k yellow gold and accented with diamonds. It is available from LA’s Roseark, either through their shop or online, for USD $5904.