The gemstone would be called アメジスト /a me ji su to/ and アメシスト /a me shi su to/ both. Japanese word for it would be 紫水晶 /mu ra sa ki sui shou/ meaning 'purple/violet crystal'.
As for the color, it can be translated as 明るい紫色 /a ka rui mu ra sa ki i ro/, 'akarui' meaning 'light, bright' and 'murasaki iro' meaning 'purple/violet'. ライラック色 /rai ra-kku i ro/ meaning 'lilac (color)' and 濃紫色 /ko mu ra sa ki i ro/ meaning 'dark/deep purple' can be situationally synonymous to it.
The Japanese word for "amethyst" would be one of these:-amejisuto,-ameshisuto,or-murasakisuishou.
What is the word 'Honorable' when translated from English to Japanese.
The word sick when translated from English to Japanese is mukatsuku.
The word 'maple' when translated from English to Japanese is カエデ.
The word drag when translated from English to Japanese is hipparu.
There is no equivalent word in Japanese for the English word "a."
The word crown when translated from English to Japanese is oukan or kuraun.
The word listener when translated from English to Japanese is kikite or risuna.
The word 'champion' when translated from English to Japanese is ăăŁăłăăȘăł (champion).
Of= No in Japanese
There's no such word in Japanese.
Tsuki when translated from English to Japanese means "moon".