The identification of gemstones is an important topic in the field of cultural heritage, given
their enormous value. Particularly, the most important precious stones, namely diamond …

Spinel is a precious stone with a long history. In ancient societies spinel was considered to
be an imitation of ruby. With the depletion of ruby mineral resources, gem—grade spinel has …

The impact of 316L stainless steel discolouration on chloride induced pitting corrosion was
quantified. Several degrees of discolouration were produces by chemical passivation …

Purple-violet gem spinels from Tanzania and Myanmar have been investigated for their
gemological, spectroscopic, chemical, and colorimetric characteristics. Samples TS and MS …

Natural spinel (MgAl2O4) usually contains some minor and trace elements (eg, Cr, Co, Fe,
V) that may cause various hues. The ratios of these chromophores directly affect the color …

MATERIALS AND METHODS Materials. The Vietnamese spinel (sample VN, figure 5) was
acquired from Geir Atle Gussiås and Mai Tran of Balder Gems. They purchased it from …

The price of spinel has sharply risen in recent years, and its market acceptance is extending.
Among the many sources of spinel, Man Sin in Myanmar is the most famous for its bright …

Spinel-type inorganic pigments with intensive color and chemical/thermal stability are
showing extensive applications that could be further broadened by color manipulation and …

Fluorescence plays an important role in determining the color appearance of fluorescing
minerals. This paper discusses the color mechanism in the red spinel and the color effects …

With the growth of the Myanmar spinel market in recent years, spinels of colors other than
red, including gray spinels, have gained increasing popularity. In this study, we performed …