About gems


The Tsavorite

The Tanzanite

The Mandarin-Garnet

The Yellow tourmaline

The Paraiba Tourmaline

The Tsavorite

This stone belongs to the garnet family and is a grossular which receives its special green color from the trace elements chromium and vanadium. Iron-oxide can give this stone a yellowish touch. The Tsavorite was found in 1967 for the first time by the Scottish gemologist Campbell Bridges in the north of Tanzania. Today Tsavorites are world-famous and in demand. Tsavorites of excellent qualities and weights over 3 or even 5 carat are extremely rare. Top qualities over 10 carat are absolute rarities. However, as we have connections as well as access to the market, we are able to help you with purchasing these.

Here we want to mention that Tiffany & Co. helped to promote the gemstones Tsavorite and Tanzanite in the world. If more media will follow this practice in the future these stones might reach even higher prices.

The Tanzanite

This stone has a very attractive color (blue with a tint to violet) and cannot be synthesized so far. It was discovered in 1967 in Tanzania at the foot of the Kilimanjaro mountain. In 1968 the Tanzanite was named by Henry Platt, the then president of Tiffany & Co. The most famous source, Arusha in Tanzania, yielded the only really good qualities of this stone. So far there are Tanzanites in good color and sizes available on the market, but not enough to fulfill the demand of the world.

Its strong pleochroism (different shades of color in different directions of view) makes it possible to distinguish it from imitations very quickly with the naked eye. Unheated Tanzanites exhibit a certain brownish touch under a polarisator (a cheap, easy instrument) so they are detectable quickly. In addition, the stone is workable well.

Together, these points lead to the Tanzanite being a sought-after, crisis-safe investment stone. Also in future it can always be recut to a demanded cut of the specific time and market in the future with less weight loss. When this stone receives more attention in the media the demand will rise even more – even now the best qualities lie in safes of wholesalers as an investment that only wait for a “Tanzanite boom” to sell it for higher prices. Only through very few people and connections you will have access to good Tanzanite qualities. We do have these connections and access.

The Mandarin-Garnet

Until the first findings of Mandarin Garnet the orangey colored spessartine (from the findings in the Spessart, Germany) was the only orange garnet on the market. Most of the spessartines are of lower transparency and therefore quality, spessartines in bigger sizes and good quality are also very very rare. So when in1991 the findings of Mandarin Garnet from the regions in Namibia and Angola topped the spessartine-garnet they were promoted on the world-market to reach world-fame. Sadly, the few mines in that area were depleted shortly after finding the good quality Mandarin Garnets. In 1994 spessartines were found again in Nigeria. These ones were of good quality and could exhibit the same transparency, brilliancy and color as the Mandarin Garnets. Mandarin Garnet and spessartine garnet have a different chemistry, the color of the Mandarin Garnet has a slight yellowish tint. The specialties of top quality Mandarin Garnets are their bright orange color and high light refraction, which produces a high brilliancy.

The chemistry of the Mandarin Garnet is not usable for any technical purpose, so from technical garnets no imitations will reach the market. In addition, the demand for this garnet variety is high and even specialized traders cannot supply a sufficient amount. Due to its rarity and the high demand from top and VIP-jewelers no one can say if there are any stones left on the insider market for long. We do have insight this market, however, and can use our connections for you.

The Yellow tourmaline

Yellow Tourmaline, so called “Canary Tourmaline” comes from the border between Zambia and Malawi, which is part of the East-African rift system and copper belt. Recent geomagnetic surveys make it seem likely that Canary Tourmalines might reach the market in larger quantities again. However, even inside of a single pocket that is explored, even some meters in dimensions, the colors of tourmalines vary strongly due to their crystallography and ability to form in a lot of elements. We will continue to watch the market and as it is a small area that is prospected right now we will be in the pole position to purchase the best gem qualities of Canary Tourmalines if found.

The Paraiba Tourmaline

It was found in the 1980s in the state Paraiba in Brazil. There are natural blue ones and ones that receive their “swimming-pool”-blue color after a heat treatment. The elements responsible for its color are copper and manganese. There is an official convention of operating laboratories throughout the world, the so called LMHC (www.lmhc-gemology.org) that promotes official rules for classifying gemstones and writing reports. Only such tourmalines containing copper and manganese are allowed to be named as “Paraiba Tourmalines”. If e.g. iron is also contained and supports the bluish color the classification “Paraiba” is not allowed. The Paraiba Tourmaline was found in only one locality in Brazil and it seems impossible that similar stones will be found nearby. Tourmalines of the same color were mined in Mozambique and Nigeria, but they have a different chemical composition which distinguishes them and makes the original Paraiba Tourmaline unique.