Ruby 4mm Microfaceted Round A Grade - 15-16 Inch Rhyolite This variety of opal is

This variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns

These Muonionalusta Meteorite beads

It has a hardness of 8 on the Mohs hardness scale

It was popular with the Greeks and Romans

Ruby 4mm Microfaceted Round A Grade - 15-16 Inch Rhyolite This variety of opal isRuby is a precious gemstone known for its deep red color. It is a variety of the mineral corundum, the second hardest mineral next to diamond . The presence of chromium is what gives a ruby its red color. Trace amounts of iron can also affect the hue, giving some rubies a slightly brownish or purplish tint. Ruby has long been considered one of the most beautiful and valuable gemstones on the planet. At times in ancient history, Ruby was valued more