“Punsiri”-type FTIR Spectral Features in Natural Yellow Sapphires
Testing of natural-color yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.
Update on Colored Gemstone Mining in Tanzania
Reports on an expedition to many known and new Tanzanian gem localities.
Screening of HPHT Synthetic Melee With Natural Diamonds
A screening service allows the lab to screen for synthetic material in diamond melee parcels.
Iridescent Inclusion in Tanzanite
A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.
Purple Pyrope-Almandine Garnet From Mozambique
Analysis of attractive purple garnets from a new deposit in central Mozambique.
Unusual Purple Inclusion in Emerald
Microscopic examination of an emerald revealed a purple banded inclusion with the appearance and optic character of fluorite.
Preliminary Study on Rubies Reportedly from Pokot, Kenya
Reports on the internal features and spectroscopic and trace-element analysis of rubies reportedly from Pokot, Kenya.
Type Ib Diamond Formation and Preservation in the West African Lithospheric Mantle: Re–Os Age Constraints from Sulphide Inclusions in Zimmi Diamonds
Article published in Precambrian Research 286, 152-166.
田纳西州的淡水珍珠采收
天然珍珠鉴定是珍珠研究的关键问题之一。 珍珠类软体动物和牡蛎的 DNA 研究有助于解决这一问题。 为实现此目标，GIA 派遣一支由科研和教育专业人员组成的队伍前往田纳西州，对淡水软体动物进行采样，以便用于 DNA 条形编码。 与我们一起前往田纳西州的卡姆登，看看我们如何潜水采集珍珠类贝壳。