Blue Sapphire and Yellow Sapphire are not worn together normally since both stones have incredibly high energy from planets.

"It was long believed the blue stones could only be found in southern ... was built They also determined that some of the Altar Stone's mineral grains were between 1 billion and 2 billion years ...

Many minerals form beautiful crystals, but the most prized of all are gemstones. Uncut gems often look fairly ordinary–like rocks. It's only when they are cut and polished that they obtain the ...