From my youth, I was a kind of rock hound who believed that rocks were precious possessions. I hunted and collected rock or stones of all types. As an adult, I continued an interest in financial topics, assets, and types of wealth. After decades of holding various assets including coins, metals, and gems; I found that common assets more often fell in value or had meager results. I now believe that the most valuable assets are defined by their rarity, and the more rare they were, the greater their value growth.
Many of my customers are surprised that assessing high-value gems are valued by elements beyond the 4 C's. Once a rare gem reaches the extremely rare status, all the typical rules are just the starting point, and the available comparable charts no longer apply to the per carat value. "Rarity" and "History" dramatically affect the gem value that are not considered in more common gem sizes.
When rare gems are over 20, 50, and 100 carats; the population of such large gems is small. When a gem stands out as "One in a million" the price per carat is exponentially higher than a gem of similar quality at 10 or 20 carats. In fact, rare gems may not be perfect specimens but still be highly valued.
As with fine art, the story or history of the gem may add to the mystic and reputation of the gem. The Bahia Emerald at 37 kg, the Andamooka Opal at 40.6 g, the Delong Star Ruby at 20.064 g, or the Star of Bombay at 36.4 g are all multi-million dollar acquisitions with immense future value.
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