Verification of truth — Property associated with diamond Which of the following is associated with diamond (as its most characteristic property)?

Introduction / Context:
Several attributes describe diamonds, but one stands out universally in general knowledge and science classes: exceptional hardness.

Given Data / Assumptions:

• We pick the single trait most classically tied to diamond.

Concept / Approach:
Compare salience and universality of each option.

Step-by-Step Solution:
Diamond ranks at the top of the Mohs hardness scale (reference trait in textbooks).“Brilliance” is notable, but many gemstones are brilliant; brilliance depends on cut as well.“Use” is vague and not a property; “Conductivity” is not what diamonds are popularly known for (they are thermal conductors but electrical insulators; this nuance is not the hallmark in verbal tests).

Final Answer:
Hardness