https://twitter.com/kiraki217_jpn/status/931160883136413696

11:03 PM - 16 Nov 2017 JST
サキモリの硬度は如何ほどか。

https://twitter.com/kiraki217_jpn/status/931487793523572736

8:42 PM - 17 Nov 2017 JST
フォロワさんからのイメージを聞くにやっぱり翼さんはサファイアっぽいよね…！個人的には紫がかった青色が美しいタンザナイトとかも素敵だなって思った…！💎

Tweet has an image of Tanzanite (Blue Zoisite)

Mohs hardness values:
- Tanzanite - 6.5
- Sapphire - 9.0

https://twitter.com/kiraki217_jpn/status/931160883136413696

11:03 PM - 16 Nov 2017 JST
What's the hardness of Sakimori?

https://twitter.com/kiraki217_jpn/status/931487793523572736

8:42 PM - 17 Nov 2017 JST
The impression I heard from followers is of course that Tsubasa-san is like a sapphire...！Personally I thought something like Tanzanite with its beautiful purplish-blue color would also be nice... !💎

Tweet has an image of Tanzanite (Blue Zoisite)

Mohs hardness values:
- Tanzanite - 6.5
- Sapphire - 9.0