When it comes to selecting a gemstone for an engagement ring, a piece of fine jewelry, or any other special occasion, the ...

Red corundum is known as ruby and all other colored corundum (including colorless, or white sapphire as it is known in the trade) is sapphire, although blue is the most well-known. Sapphire is ...

Thailand’s gemstone deposits typically produce blue, green, and yellow sapphires (and combinations of these colors ... star with one set of golden-yellow rays and one set of silver-white rays. The ...