Filtres

Price

Between 
and 

Carats (Weight)

Between 
and 

Stone clarity

Length (mm)

Between 
and 

Width (mm)

Between 
and 

Depth (mm)

Between 
and 

Tourmaline

What is Tourmaline? Group: silicates Sub-group: cyclosilicates Etymology: from Sinhalese thuramali or thoramalli, meaning "stone of a thousand colors" or "stone of mixed colors," or from Tamil "tourmali" or "torra molli," meaning "stone that attracts ashes." Hardness (Mohs scale): 7 to 7.5 Main deposits: Brazil, Mozambique, Madagascar, Nigeria, Myanmar, Afghanistan, Namibia, Pakistan, USA, Russia, Kenya... Colors: virtually all, depending on the elements it contains Chemical composition: (Na, Ca, □)(Li, Mg, Al, Fe)2(Al, Fe, Cr, V)6(BO3)3[Si6O18](O, OH, F)4, but varies depending on the variety (see table) Crystal system: rhombohedral Constitution: complex silicates of aluminum borosilicates with iron, magnesium, and alkalis Development environment: granite, pegmatite, greisen, quartz veins, migmatite, gneiss, and mica schist.

There are 39 products.

Showing 1-24 of 39 item(s)