Very exciting to find a new crystal to stock and that was Heliodore tumbles in 2018. Part of the beryl family as is aquamarine it also has that shimmer that can be sometimes seen in the beryls.
The crystal is you be very objective and helps in correct decision making based on factual judgement. It also improves the cogency of thought and also blesses with good communication abilities.
Dimensions are approvimate, use the photo as a guide. You will get one of the heliodore tumbles in photo.