How is durability defined in the context of gemstones?

Durability in the context of gemstones refers specifically to a gemstone's ability to withstand various forms of wear, heat, and exposure to chemicals without suffering damage. This includes resistance to scratching, breaking, and chipping, as well as the ability to maintain its appearance over time despite environmental factors.

Gemstones that are considered durable can be used in jewelry that is worn regularly without the same level of concern for damage that might be required for more delicate stones. This characteristic is essential for both jewelers and consumers as it affects how and where a gemstone can be used.

The other options do not pertain to the concept of durability. Intensity of color relates to how vivid or saturated the gemstone appears, while size concerns the dimensions of the stone itself. Clarity rating pertains to the presence of inclusions and blemishes within the gemstone, which relates to visual quality rather than durability.