jemna -jme- gismu

x₁ is a gem/polished stone/pearl of type x₂ from gemstone/material/source x₃.

Also jewel (= jmeja'i); gemstone (= x₂, x₃, or jmero'i, jmekunra); pearl (= selcakyjme - a gem found inside a shell, tercakyjme - a gem made of shell material, boijme - any ball-shaped gem), mother-of-pearl (= cakyjme). See also kunra, rokci, jadni, dirba, kargu, krili, pulji.

In notes:

dirba: x₁ is dear/precious/darling to x₂; x₁ is emotionally valued by x₂.
jadni: x₁ (object) adorns/decorates x₂; x₁ is an adornment/decoration of x₂; x₂ is fancy/decorated.
kargu: x₁ (object/commodity/property/event) is costly/expensive/dear to x₂ by standard x₃.
krili: x₁ is a quantity of/contains/is made of crystal of composition x₂ in form/arrangement x₃.
kunra: x₁ is/contains/is made from a mineral/ore of type/metal x₂ mined from location/lode/mine x₃.
pulji: x₁ is a police officer/[enforcer/vigilante] enforcing law(s)/rule(s)/order x₂.
rokci: x₁ is a quantity of/is made of/contains rock/stone of type/composition x₂ from location x₃.
cicnyjme: j₁ is a turquoise (gem/polished stone) of type j₂ from source material j₃.
tabykrili: k₁ is crystalline carbon (default diamond) in form/arrangement k₃
amtisti: x₁ is a quantity of/contains/is made of amethyst from source x₂.
jemnrsapfiro: x₁ is a sapphire [gem/polished stone] of type x₂ from source x₃.