Which treatment method for turquoise appeared in the 1980s and has been used extensively since then?

The treatment method for turquoise that gained prominence in the 1980s and continues to be widely utilized is indeed the Zachery method. This process involves the injection of a colored resin into the porous structure of the turquoise to enhance its appearance and durability. The technique allows for improved color saturation and stability while making the stone suitable for a broader market.

The Zachery method specifically addresses the challenges of natural turquoise, which can often have inconsistent color and a relatively soft structure. By employing this treatment, the stone becomes more visually appealing and can withstand everyday wear. This treatment has had significant influence on the turquoise market, allowing for a larger variety of options that appeal to consumers and jewelers alike.

The other methods mentioned do not have the same historical context or impact as the Zachery method regarding turquoise treatment during the 1980s. For example, while heated methods can enhance some gemstones, they are not specifically associated with turquoise. Similarly, pressure treatment and color-enhanced methods do not have the same recognition or widespread use for turquoise as the Zachery method.