The Mack Podcast · 2026-08-05 · 20 min
In most portfolios, diversification follows a familiar path of public markets, private equity, real estate, and other traditional alternatives. But what about tangible assets that combine rarity, portability, and long-term value? In this episode, Brian Adams sits down with graduate gemologist Doris Hangartner to explore the investment potential of rare colored gemstones. They discuss how gemstone portfolios are constructed, the market trends driving demand for emerging colored stones, and why some families are incorporating gemstones into broader wealth preservation and legacy planning strategies. To learn more about Mack International, please visit This episode is sponsored by BanyanGlobal Family Business Advisors. Banyan works with family business owners to navigate complex decisions around succession, ownership, and long-term strategy - helping families clarify their options, align as a group, and move forward with confidence. Learn more at banyan.global.
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