Sapphire Archives

2023

Dehydration of Diaspore and Goethite during Low-Temperature Heating as Criterion to Separate Unheated from Heated Rubies and Sapphires

Dehydration of Diaspore and Goethite during Low-Tempera […]

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Research Articles

Ruby Sapphire Treatments

2023

Effects of Gamma Irradiation on Ruby and Pink Sapphire and Potential Detection Methods in Gem Labs

Keywords: Ruby, Pink sapphire, Gamma irradiation, UV-VIS, Raman, R-Line

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Research Articles

Ruby Sapphire Treatments

2023

New and additional criteria  to detect low-t heated corundum

Heat treatment of ruby, sapphire and other colour varieties of corundum is one of the main issues for the gem trade. As such, detecting such treatment is a major task of gemmological laboratories issuing gemstone reports. Unfortunately, and especially lately, the detection of such heating is not always straight

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Sapphire

2023

Ti-diffusion treated sapphire cabochons

Titanium diffusion treatment is known since decades: it can lead to a surface-related blue colour in corundum. Basically, this treatment is a heating process requiring high temperatures in combination with titanium (oxide) as an additive. During the treatment, titanium atoms penetrate into a superficial layer o

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Sapphire

2023

Pink sapphire with orange iron hydroxides in fissures

Padparadscha is one of the most attractive corundum varieties in the trade and is sought after for its subtle pinkish orange to orangey pink colour. Padparadscha, originally known from Sri Lanka only, is found today also in other deposits such as for example in Madagascar and Tanzania, both part of East Africa

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Sapphire

2022

Zircon inclusion analysis for sapphire origin determination

Zircon ZrSiO₄ a very intriguing mineral, not only because it can be used as an attractive gemstone (Figure 1) but also due to the fact that it can contain minute traces of radioactive elements (U, Th), which decay over time to lead (Pb) isotopes.

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Origins Sapphire