Guide
Emerald: untreated from the Habachtal and from ...
Almost every emerald in the trade is oiled or resin-filled. Why untreated stones are rare, what sets apart the emeralds from the Austrian Habachtal and from Torrington in Australia, and...
Emerald: untreated from the Habachtal and from ...
Almost every emerald in the trade is oiled or resin-filled. Why untreated stones are rare, what sets apart the emeralds from the Austrian Habachtal and from Torrington in Australia, and...
Red beryl: the red relative of emerald from Utah
Red beryl of cuttable quality comes from a single mountain range in Utah. Why that is, why the stones hardly ever reach one carat, and what to look for when...
Red beryl: the red relative of emerald from Utah
Red beryl of cuttable quality comes from a single mountain range in Utah. Why that is, why the stones hardly ever reach one carat, and what to look for when...
Grandidierite: the rare blue-green from Madagascar
Grandidierite was for years called the rarest gemstone in the world. Where it comes from, why one and the same stone shows three colours, and what to look for when...
Grandidierite: the rare blue-green from Madagascar
Grandidierite was for years called the rarest gemstone in the world. Where it comes from, why one and the same stone shows three colours, and what to look for when...
Hauyne: the rarest blue gemstone of the Eifel
Hauyne is one of the rarest facetable gemstones of all — and in gem quality it comes almost exclusively from a volcanic region in Germany. What makes the stone special,...
Hauyne: the rarest blue gemstone of the Eifel
Hauyne is one of the rarest facetable gemstones of all — and in gem quality it comes almost exclusively from a volcanic region in Germany. What makes the stone special,...