Most of the chalcedony stones are found in colors of blue, gray, or white. The blue chalcedony variety, in particular, is found to be the most valuable because it shows subtle adularescence – which is nothing but an internal glow, which is shown in gemstones such as the moonstone. In the context of birthstones, chalcedony has been found to be the May birthstone, even historically. And it is still a zodiac stone for Gemini. Certain chalcedony varieties are also gifted as presents on wedding anniversaries.
Types of Chalcedony – Colored Gemstones Guide
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