Below you can find the This blue gemstone has been highly valued since around 800 b.c. Jeopardy Words Answer. The answer to This blue gemstone has been highly valued since around 800 b.c. has 8 letters. This clue belongs to the 8-letter words category and is part of Jeopardy Word Level 1101. If you scroll near the bottom you will find other clues and answers part of level 1101