Shinagawa Aquarium Souvenir 3D Crystal Figurine Rare?

This is a souvenir received by a family to commemorate their visit to Shinagawa Aquarium. It's likely a commemorative item for being a certain number of visitors, like 1,000,000th visitor! (Perhaps it's a rare item?).

This is a crystal-like ornament with 3D engraving.
The size is approximately 7cm in height and 2.6cm x 2.6cm at the base.

Dolphins, seahorses, sea turtles, octopuses, and more are depicted swimming joyfully. (Personally, I like the octopus design) (^.^).
Photo ① shows the item illuminated from below. A light is not included with this product. Photos ② show the corners glowing yellow and blue, but the actual item is completely transparent.

This has been stored at home for many years. The box is not included.

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