silver, platinum, chains
鐐 centers on precious metals used for binding: silver, platinum, and chains. The chain sense likely extends from the metal shackles or fetters made from these materials.
鐐 combines 金 (metal) with 尞, which likely contributes the sound. The character originally referred to silver or a silver-like metal, and by extension metal chains or fetters.
The left side 金 (metal) and the right side 尞 (which looks like a person with a large head and legs) can be imagined as a person bound in silver chains: the metal shackles are made of precious silver.
For リョウ, imagine a silver chain being used to leash a lion: lion -> リョウ, and the silver chain restrains the lion.