As a gemologist with a deep appreciation for the beauty and rarity of precious stones, I have a profound understanding of the factors that contribute to the value of gemstones, including moonstone. Moonstone, known for its enchanting adularescence, is a variety of the feldspar mineral and is treasured for its unique optical phenomenon that gives it a soft, billowy glow reminiscent of moonlight.

The value of a moonstone is determined by a combination of factors, including its transparency, body color, adularescence, and origin.
Transparency is a critical attribute; the more transparent a moonstone is, the more it allows light to pass through, enhancing its luminescence. However, it's not just about being transparent; the body color of the moonstone also plays a significant role. A moonstone with a colorless body is generally more desirable than one with a gray or brownish hue, as the former allows the adularescence to be more vividly displayed.

Speaking of adularescence, this is the characteristic shimmer that resembles the moon's glow and is the hallmark of a high-quality moonstone. The blue sheen is particularly prized, as it is considered the most beautiful and valuable. The intensity and movement of this sheen are also important; a stone that displays a strong, vibrant, and shifting blue glow is more valuable than one with a weak or static sheen.

The origin of the moonstone can also affect its value. Historically, the most valuable moonstones have come from Myanmar, formerly known as Burma. These stones are renowned for their exceptional quality, with a strong blue sheen and a colorless, transparent body. Unfortunately, as you mentioned, the mines in Myanmar are largely depleted, making these stones increasingly rare and, consequently, more valuable.

However, it's important to note that while Myanmar moonstones are highly sought after, other sources can also produce high-quality stones. India, Madagascar, and Tanzania are among the countries that have become significant suppliers of moonstones in recent years. The value of moonstones from these locations can be comparable to those from Myanmar, depending on the stone's specific qualities.

In conclusion, the value of a moonstone is a complex interplay of its transparency, body color, adularescence, and origin. While historical precedents and market demand influence its worth, the intrinsic optical properties of the stone are what truly captivate the hearts of gem enthusiasts and collectors.

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Moonstone Value. Generally, the more transparent and colorless the body and more blue the adularescence, the higher the moonstone value. ... Historically, the most valuable colorless, transparent moonstones with strong blue sheen came from Myanmar. Unfortunately, this material is essentially mined out.read more >>