As author Vincent Pardieu notes, however, blue sapphire with a natural beryllium content has been reported on several occasions, in material from a variety of sources. The best way to obtain a ...
The 330-ct Star of Asia is in the collection of the National Museum of Natural History – Chip ... color is the standard against which other blue gems—from topaz to tanzanite—are measured. For ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results