Typical caddisfly larvae build themselves protective pouches of silk adorned with river sediment: pebbles, twigs, and sand. Hubert Duprat's caddisfly larvae have more lavish tastes. Duprat provides them with gold flakes and jewels, including pearls, turquoise, rubies, and sapphires. When the larvae become full-fledged caddisflies, Duprat turns their abandoned tubes into wearable art.
Larvae-made jewelry (video link below): These beautiful pieces are the unusual collaboration between French artist Hubert Duprat and a busy little crew of caddis fly larvae... the insects manufacture cases to protect their developing bodies ...he carefully prods them out of their own natural cases and re-houses them in aquariums filled with substitute materials...When the larvae develops its wings it abandons the case. http://www.thisiscolossal.com/2014/07/hubert-duprat-caddisflies/