
The ruby has been the world's most valued gemstone for thousands of years. It was said to be the most precious of the twelve stones God created when he created all things and this "lord of gems" was placed on Aaron's neck by God's command. The Bible says that wisdom is "more precious than rubies," that is to say very valuable indeed. In the ancient language of Sanskrit, the ruby is called ratnaraj, or "king of precious stones" and ratnanayaka, "leader of precious stones." In fact, rubies are today still more valuable and rare than even the top quality colorless diamonds.
The following quotation is from Kabir: Ecstatic Poems, versions by Robert Bly.
The small ruby everyone wants has fallen out on the road.
Some think it is east of us, others west of us. Some say, “among the primitive earth rocks,” others, “in the deep waters.”
Kabir’s instinct told him it was inside, and what it was worth, and he wrapped it up carefully in his heart cloth.