This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Something that simulates something else such as, for example, a gemstone.

Simulating (something else); appearing to be (what it is not); replacing (in position or in aspect): with of: used especially in biology: as, a scutum simulant of a scutellum; cheliceres simulant of chelæ; stamens simulant of petals, or conversely.

n. One who or that which simulates something else.

"Initial lots will weigh just tens of pounds to ensure that the simulant is made correctly."