A Caribbean lagoon mystery, seen in tanzanite
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FIGURE 1

  A Caribbean lagoon mystery, seen in tanzanite

by Guy Borenstein FGA
October 16, 2012


In the Gem Color Report of February 2012, we analyzed the color of an unusual green-violet tanzanite, and ever since then these remarkable rare colors have been on display at trade shows around the world. It warmed our heart then, and now again, when we realized that it was a kick-off for other rare tanzanite colors entering the market, and aiming to be a next hot trend.

One of these very rare unheated natural colors was displayed in a green-blue, 15.92-ct. cushion-shaped tanzanite, provided to us for examination by
Advanced Quality ACC. This beautiful gem was sent to the Gemewizard team for color analysis, to better understand how its color components merged and created its Caribbean lagoon appearance.

We took a photo of the tanzanite gem face up, to capture its green/blue merged color. We then analyzed the image to define its overall color, as seen by the human eye. From this, we located the combined components and their ratios to understand the structure of the color mix.

As indicated in Figure 1, the overall color corresponds to Gemewizard code 20-5-1, or Medium Grayish greenish Blue. This is derived from 66% Medium dark Grayish Blue (22-6-1), and 33% Light Slight Grayish Green-Blue (18-3-2).

The mysterious seawater-like color, which is certainly not a typical for tanzanite, explains why these gems have become sought after by buyers. By breaking the overall color to individual components, we reveal the mystery behind it. There are actually two different color areas inside the crystal. One is a naturally heated ink blue color while the other is the typical pre-heated green.

However, understanding the color is not enough to design the faceted gem. We still needed to understand how the owners merged it together. Kobi from Advanced Quality ACC was kind enough to explain us that each gem was carefully planned based on the color orientation within the crystal, and then fashioned in a specific style. It allowed the colors to merge together, creating a remarkable Caribbean lagoon-like gem.