bidju gismu

x₁ is a bead/pebble [shape/form] of material x₂.

In notes:

bolci: x₁ is a ball/sphere/orb/globe [shape/form] of material x₂; x₁ is a spherical object [made of x₂].
canre: x₁ is a quantity of/contains/is made of sand/grit from source x₂ of composition including x₃.
dirgo: x₁ is a drop [small, cohesive shape] of material [liquid/vapor] x₂ in surrounding material x₃.
lakse: x₁ is quantity of wax [substance especially soft/moldable when warm] from source x₂.
selbidju: x₂=b₁ is a bead/pebble (shape/form) of material x₁=b₂.