In that article, three Ohio diamonds, all found in the last century, were described: a stone found in Cuyahoga County, south of Cleveland, about 1870; an occurrence in Hamilton County about 1880; and a discovery in 1899 in Clermont County.

Natural diamonds are finite resources, and their availability can impact their value. Indeed, the lab-grown diamond market may have temporarily distressed the demand for natural stones, however the oversupply of man-made diamonds appears to have reached its apex and prices are now declining.

But they're not an investor's favorite currently, with the precious gems losing some significant value over the last few months. Diamond prices are down 18% from their all-time highs in February 2022, and are lower 6.5% year-to-date, according to one Global Rough Diamond Price Index.