What about a Lab Report/Certificate?

What About a Lab Report? To start, while we are asked about certificates from labs, it should be pointed out that all labs only issue reports, not certificates–and those reports are professional opinions, not guarantees. When it comes to guarantees, we guarantee that our stones are exactly as stated with regards to gem species and…

Heat Treatment of Tanzanite (Zoisite)

Introduction We’re often asked about why and how certain gems are treated, particularly heat treatment.  This short article will help explain why we heat some of our Tanzanite. Tanzanite is the trade name applied to blue-violet zoisite from Merelani, Tanzania. This gem is fascinating because of its rarity–so far it’s only ever been found in in…

Aquamarine

Overview Aquamarine is the blue-green to blue gem variety of the of the mineral beryl.  It’s been known and used as a gemstone since antiquity.  The color of aquamarine can range from a very pale blue-green to a deep strong blue (“Santa Maria” blue is some of the finest blue aquamarine known); the value increases with the depth of…

Emerald

Overview Emerald is one of the most well-known and desired colored gems known to mankind.  There is evidence of emeralds being mined and used in jewelry going back to over 3,500 years before present. It is a variety of the gem beryl, colored green by minute traces of chromium, vanadium or both.  While emerald has…

Tanzanite

Overview Tanzanite is a trade name for deep blue to violet zoisite, colored by the presence of trace amounts of the element vanadium.  It was first discovered in 1967 in the Merelani Hills of Tanzania and was named and marketed by Tiffany’s.  While zoisite is found around the world, and is sometimes even gem-clear, the…

Tourmaline

Overview Tourmaline is a remarkable gemstone, coming in an incredible variety of colors. Tourmaline can also be found in multi-colored forms, which is relatively uncommon in gemstones.   It is actually a family of minerals that share a similar chemical structure.  Most gem tourmalines are of the elbaite type, although certain dravite and liddicoatite tourmalines…

Grand Opening!

Welcome to Earth’s Treasury–your source for fine gemstones, jewelry and gem mineral specimens. Earth’s Treasury was founded in 2012 as the realization of many of my passions: gems, minerals, jewelry, photography and more.  I want provide the public with a focused collection of gems and jewelry created primarily from natural stones and materials mined from…