What is the most expensive birthstone?

Your question has no clear-cut answer, what I mean is that the value of certain birthstones and gemstones relies on a myriad of factors such as size, quality, clarity, color, etc. In general, diamonds are considered to be of the highest value when it comes to birthstones, however, that is not always the case. Diamonds with a low carat weight/poor clarity/poor color grade are considered low quality and may have lower value than other colored gemstones of a higher quality. For instance, large rubies which possess intense red hues are rarer, and thus are more expensive than some diamonds. Generally speaking, the four precious and unique (and the most expensive) gemstones are diamonds, rubies, emeralds and sapphires. Those four birthstones would typically cost you more to purchase than topaz, citrine, onyx, garnet etc.

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