It is important to invest in natural stones, also with natural inclusions in them, which cannot be put in by man. Visit “About Gems” to have a look at our preselection of natural gemstones here on our homepage.
Small, minor inclusions which are invisible to the naked eye are not lowering the transparency that much; the visual experience for the buyer is not disturbed and the stone still shows its body color, brilliance and transparency. However, too many natural inclusions can lower the stone’s eye clarity unless it is a stone that gains its character through inclusions – like the aventurine-quartz. We are talking about characteristic inclusion forms and “inclusion pictures” here that cannot be artificially created. As an example check out hollow channels with diaspore filling in tourmalines and diffusion remnants (element-wandering pictures) induced by tecto-chemical events in stones.
Thus, it is vital to find the right “mixture” – a minimal amount of inclusions that do not influence a stone negatively but mark it as of natural origin. And an essential point should not be missed out: Some inclusion might not always be the one you want in an investment stone. For example, today it is easy to produce rutile needles in a synthetic ruby.
For that reason, it is necessary to distinguish “safe” nature inclusions for the future from ones that can be artificially added to a synthetic stone. We do work together with graduated mineralogists and gemologists from world-renowned institutes and laboratories and so we have access to their background knowledge. With good reason we wrote “world-renowned laboratories” – every more valuable stone should be graded and certified by an official lab – the German lab is the DSEF (Deutsche Stiftung Edelsteinforschung), there also exists the GIA (Gemological Institute of America) and a few others.
Another pivotal point to consider when talking about the genuineness of a gemstone is the treatment of stones. Let us have a look at the Yellow Tourmaline and the Paraiba Tourmaline for illustrating purposes.
Yellow Tourmalines can be treated by first irradiating them which is to be declared making them “treated tourmaline” which lowers the price. Secondly, these tourmalines are heated to stabilize the manganese ion in the structure as a yellow color center. As we have just pointed out only untreated stones are interesting as an investment stone.
Paraiba Tourmalines can be treated by heating them as well, in most cases improving their blue color. This has to be declared as “general treatment” but is a measure accepted on the market. Therefore, these tourmalines do not have to be declared “Treated Paraibas” in trading.For someone being new to gemstones, not necessarily investing in it, it is necessary to get that kind of professional help we provide with our network as there are many imitations, artificial products faking natural stones etc. out there.
To get an idea of what good quality actually means and what would be a good price for it you should also compare colors and transparencies of stones of the same type. To do this, we recommend the “GemGuide” as a start. In this magazine a lot of interesting stones and prices of certain carat weights and qualities of them are listed. These tables represent usual prices in the wholesale market, be aware that the retail market charges you about 150% more. In this GemGuide the prices for excellent qualities and cut are just described with “... extra fine qualities can ask for an extra charge”, so they are placed far above all other jewelry qualities used in the market today. Exactly these qualities are the ones you should look for when you acquire an investment stone.
By the way, we can even undercut wholesalers’ prices in the segment of excellent quality and cut. This is due to our network of miners and professionals that are present at all the important fairs in the world and thus can make “lucky finds”.
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