Telescope gem ?

[RawrIisKiba]

Where did you get the telescope gem ?

[samurai goroh]

There's no such thing as a telescope gem, but if you meant Teleport Stone:

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Teleport Stone
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Description: Teleport to a location of your choice.
How to get it: Found it on the last floor (255) of the Spring Mine, it will only appear on the year 3 & after.
Buy: N/A
Sell: N/A
Store: Tool Box, Tool Bag
Stamina: - 2
Fatigue: + 0

Or if you really meant for a gem, there are only 3 of them:
http://www.fogu.com/hm4/farm/gems.htm