The phrase "investment grade" has a long history in gem and jewellery marketing and an equally long history of attracting regulatory scrutiny. Across markets, the language sits at the intersection of permitted descriptive trade vocabulary and prohibited financial promotion, and the line between the two has been the subject of repeated FTC and other regulator interventions over more than four decades.

The promoter pattern

From the late 1970s onwards a recognisable promoter pattern emerged in the United States, Canada, the United Kingdom and Australia. Sellers approached non-specialist consumers, often by telephone or by direct mail, and offered diamonds or coloured stones at prices they described as below wholesale, with claims that the stones would appreciate substantially over a defined holding period. Stones were typically delivered sealed in plastic with laboratory reports, and consumers were instructed not to open the packaging. The phrase "investment grade" was central to the pitch because it implied a recognised classification when in fact none existed.

FTC actions and the Jewelry Guides

The Federal Trade Commission has periodically intervened against firms whose use of investment language crossed into deception. The Jewelry Guides at 16 CFR Part 23 codify the relevant standards, requiring that any representation about a gemstone's future value be supported by a reasonable basis and that comparisons to wholesale, retail or appraised values be substantiated. The 1980s gem investment scams produced a wave of FTC and state attorney-general cases against firms that had marketed coloured stones, particularly emerald, ruby and tanzanite, with unsupportable appreciation claims. Subsequent waves accompanied the rise of coloured diamond marketing in the 2000s and the laboratory-grown segment in the 2020s.

The structural problem with investment claims

The gem trade lacks several features that make a serious investment market function. Liquidity is poor: dealer buy-sell spreads are typically 30 to 60 per cent or more, depending on category. Price discovery is fragmented: there is no central exchange, and auction results, although public, cover a small slice of the market and depend heavily on consignor reserve and buyer's premium effects. The cost of carry includes insurance, storage and the opportunity cost of capital. None of these features prevents a sophisticated buyer from holding stones successfully, but they make the unqualified retail claim of investment grade misleading without substantial qualification.

What responsible language looks like

Responsible trade language about gem value is specific, conditional and traceable. It refers to actual auction comparable sales, names laboratories whose reports the market trusts, distinguishes between consumer retail price and trade or auction price, discloses all treatments and any uncertainties about treatment status, and avoids forward-looking statements unless those are explicitly framed as opinions. The phrase "a stone of investment quality" is significantly different in tone from "a guaranteed investment" or "will double in five years", and only the first comes close to surviving FTC scrutiny.

The role of laboratories and major houses

The most useful single signal in distinguishing serious from promoter-grade language is the involvement of the major laboratories and auction houses. Stones genuinely positioned for value retention come with reports from GIA, Gübelin, SSEF, Lotus Gemology, AGL or one of the other widely recognised laboratories, and they trade through Sotheby's, Christie's, Bonhams, Phillips, Heritage, or established dealer-to-dealer networks. The absence of these credentials, particularly when paired with high-pressure direct sales, sealed packaging and warnings against independent appraisal, is itself the strongest negative signal a buyer can identify.

The current landscape

Modern promotional schemes have adapted with the times. Tokenisation of gems on blockchain platforms, fractional ownership offerings, and "members only" insider pricing structures have all carried the investment-grade language into new packaging while preserving the underlying problems. Regulators including the FTC, the SEC where securities-like structures are involved, and equivalent bodies abroad have taken action against several such schemes, and the trade press has documented many more. The vocabulary endures in part because it is genuinely useful when applied carefully and in part because it remains attractive cover for less careful applications.