Diamond Prices: A Small-Stone Bounce Inside a Much Longer Slump
Natural white diamonds have shed more than half their wholesale value since 2021, yet Rapaport's August RapNet Diamond Index posted its first one-carat gain in fifteen months. The rebound is concentrated in smaller, liquid categories — not a verdict on the whole book of mined stones.
NBC on Saturday, 26 September framed natural diamonds as having lost much of their shine: Rapaport Group data cited in the piece put the average one-carat stone at $3,898, 51% below the $8,007 level of 2021. The Diamond Standard Index for investment-grade goods touched 2,490 in early August — described as a record low — and was trading just above 2,500 later in the month. The through-line was structural: a Covid-era production glut still working through dealer books, compounded by lab-grown stones that undercut naturals on price at every carat weight. Two weeks earlier, on 2 September, Rapaport published a narrower, segment-level counterpoint. The Rapaport Trade Diamond Index (RAPI) — which tracks asking prices for round, D–H, IF–VS2 goods on Rapaport Trade — rose…
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