Is it a yellow sapphire? What could be its value?

[rarora]

Hi,
I have found a stone in my backyard & it looks a precious stone. It measures 2.5 inches by 1.5 inches. I am curious to know what kind it is and if it has any value. I would appreciate advice from experienced members.
Thanks

 

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[gunsil]

Where do you live?? It looks like it may be a semi-precious agate known as "Montana agate"

 

[old digger]

Welcome to TNET. Looks like a nice piece of river tumbled quartz. Nice Find!