Blue Sky Sapphire

The Blue Sky Sapphire is a Super Meister Gemstone, that is used by the Otome Arika Yumemiya and before her the late Lena Sayers, her mother.

About
The Blue Sky Sapphire's origins are vague, but it was made before the Immigrations era which implies that it was made before the colonization of the Planet Earl. Because of this it is called a Super Meister instead of merely a Meister.

Because of this Blue Sky Sapphire is stronger, or at least more durable or unique in some way shape or form, compared to other Meister Gems as while Lena Sayers would overload most of her gems, including the Lofty Crimson Jade and be unable to maintain her Robe, the Blue Sky Sapphire was able to bring out and maintain Lena's abilities. Furthermore Arika has the ability to enter a secondary form, which Natsuki Kruger calls the "true potential" of the Sapphire specifically.

It is interesting to note that Miyu at the very least considers the Sapphire to be something of a family heirloom, as she gave it to Arika and believed it rightfully hers whether to become an Otome herself, possess an Otome or simply for the sake of her having it is never specified, but the Sapphire's abilities to bear the weight of Lena's great power and Arika's secondary form could imply a connection between the Sapphire and Alyssa Sears.

History
Made before the Immigrations Era, which implies that it origins are on Earth as opposed to Earl, the Blue Sky Sapphire is a mysterious Meister Gem that is a great deal more unique and offers powers more closer to that of the HiME's in the produced Robes as opposed to the other Meister gems but this could in part be do to Lena and Arika's latent HiME abilities as opposed to the gem.

However it is clear that the Sapphire was lost for an extended period of time, until Miyu found it and delivered it to Lena for her use.

After Lena's desmise the Gem was once again lost, and it was believed that it would reappear on the lost Princess of Windbloom. However Miyu once again discovered the Gem as it was being sold to someone in Arutai and gave it Arika feeling that it rightfully belonged to Lena's daughter.