Gemological or economic evaluation of gemstones?
Many people turn to us for an evaluation of the gems in their possession, but we must specify that the purpose of our laboratory isRead More
New discovery: the rare purple garnets of Mozambique
The most fascinating gem discovered in recent years (presumably in 2016) was a rare purple garnet with a color change from East Africa, mainly Mozambique.Read More
Engagement ring, there are many alternatives to the diamond: Emerald, ruby, sapphire … which one to choose?
For those looking for their engagement ring, an alternative to the classic solitaire with diamond, choices are endless and all of great effect and personality.Read More
When subjected to ultraviolet light, diamonds can show fluorescence. About 20% of diamonds are fluorescent under ultraviolet light with at 366 nm wavelength. The evaluationRead More
How much is the geographical origin of a gemstone worth?
The geographical origin for top quality gemstones is of relative importance as they are very rare. Specimens from new mining areas can be more beautifulRead More
The Diamond, not only brilliant cut
The best known shape for diamonds is round, the so-called “brilliant”. The common association of the term “brilliant” to the diamond stone comes from itsRead More
How to define and evaluate the colour of a precious stone
During the estimation of a gemstone colour evaluation is a critical aspect is in defining its quality and therefore its price. Colour can affect 60%Read More
Carats of a gemstone: what are them?
The unit of measurement used for gemstone weight is the carat (ct) used in trade since ancient times. The word derives from the Greek andRead More
TREATMENTS TO IMPROVE THE GEMSTONE QUALITY
– Ruby before and after lead glass filling – Since ancient times precious stones without excellent features, typical of best quality gemstones, used toRead More
CLARITY AND TRANSPARENCY of coloured gemstones
– On the left side an emerald with inclusions and weak transparency. On the right a more pure and transparent crystal – Clarity classificationRead More