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Há 5 dias · Trapiche Gems. Wim Vertriest. Download PDF. Figure 1. A pair of trapiche emerald slices from Colombia, 10.92 carats total. Photo by Kevin Schumacher; courtesy of Mayer & Watt. Jeffery Bergman is known in the trade as a collector of trapiche gems. These gems, characterized by their six-rayed patterns, are elusive and seldom found in high quality.
Há 15 horas · There are many types of backs available to hold earrings securely in place. Clutch, friction or butterfly backs are discs with curled-up tabs that oppose one another, acting as springs that pinch the ear post. The post has notches on it that function as stops so the clutch backs can hold the earring ...
Há 1 dia · GIA®’s most advanced microscope has new features to optimize greater precision and comfort. Brought To You By GIA Experience gemstones with greater precision and comfort than ever before with GIA®’s most advanced microscope – GIA® Gemolite® NXT and the premium GIA® Gemolite® NXT Professional Edition.
Há 15 horas · This is where gemstone certification plays a pivotal role, providing assurance and clarity in the murky waters of the gem trade. In this article, we delve into the realm of gemstone certification, comparing two prominent players: GIA (Gemological Institute of America) and IGI (International Gemological Institute).
Há 1 dia · Understanding the Color Scale: Diamond color grading is based on a scale that ranges from D (colorless) to Z (light yellow or brown). Diamonds that fall within the D to F range are considered colorless or near colorless and are highly prized for their purity and brilliance. As you move down the color scale towards Z, the presence of yellow or ...
Há 15 horas · Richard Mille was founded in 1999 by Richard Mille and Dominique Guenat, with the ambitious aim of producing luxury watches that combined the traditional, time-honored watchmaking craftsmanship with contemporary materials and cutting-edge design. Over the past two decades, the brand has grown exponentially, establishing itself as a leader in ...
Há 15 horas · The GIA Diamond Colour Grading. The Gemological Institute of America (GIA) created a diamond grading scale to assess the quality of a diamond based on its cut, colour, clarity, and carat (diamond 4C’s). This scale, now the gold standard, is used to assess the absence of colour in a diamond to determine its colour grade.
