Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. mineral

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by composition
6. inorganic material
7. rock
8. rock by form
9. stone
10. stone by quality
11. gemstone
12. gemstones by specific type

Anotations

Scope note:

The cubic crystalline form of zirconium dioxide (ZrO2). As a synthetic gem it is often used as an inexpensive replacement for a diamond. Color most often ranges from white to light yellow and brown, but as a synthetic, can be produced in a large variety of colors. Its refractive index and colour dispersion are fairly close to the diamond, but its hardness is lower and its specific gravity much higher.