Bid Sheet
Bid Sheet
The wholesale price list that underpins gemstone and jewellery trade liquidity
A bid sheet is a written or digital schedule of standing purchase offers issued by a gemstone dealer, jewellery wholesaler, or trading house, setting out the prices at which that party is prepared to buy specific categories of goods during a defined period. Organised by species, variety, size range, quality grade, and treatment status, bid sheets are one of the primary instruments through which wholesale price discovery occurs in the coloured-gemstone and diamond trades. They are circulated at major trade fairs, exchanged privately between trusted counterparties, or, increasingly, distributed through closed digital networks. For sellers — whether miners, cutting houses, estate liquidators, or other dealers — a bid sheet converts what would otherwise be a time-consuming series of individual negotiations into a rapid, transparent matching exercise.
Structure and Content
A well-constructed bid sheet is organised hierarchically. The outermost category is typically species or variety — sapphire, ruby, Paraíba-type tourmaline, Colombian emerald, and so on — followed by geographic origin where origin commands a premium (Burmese versus non-Burmese ruby, for instance), then by treatment status, size bracket expressed in carats, and finally by quality tier. Quality tiers are usually described in plain-language shorthand that experienced traders understand immediately: terms such as top commercial, fine, extra fine, or investment grade carry agreed connotations within a given trading community, even though they are not standardised across the industry in the way that laboratory grading reports are.
Treatment status is among the most consequential variables on any bid sheet. A ruby listed as no heat, no filler — confirmed by a reputable laboratory such as Gübelin, SSEF, or Lotus Gemology — will carry a substantially higher bid than an equivalent stone described as heated, minor filler. Dealers therefore specify not only the treatment category but frequently the acceptable laboratory reports: some bid sheets explicitly state that bids apply only to stones accompanied by a current report from a named institution, and that the bid is void if a different laboratory's conclusions are presented.
Pricing on a bid sheet is expressed as a per-carat figure in US dollars, which remains the de facto currency of the international gemstone wholesale trade regardless of where a transaction takes place. Some sheets quote a single price per category; others quote a range, with the higher figure reserved for stones that meet every criterion within the tier and the lower figure representing the floor for borderline material.
Validity and Revision
Bid sheets carry an explicit or implicit validity period. At a trade fair such as the Tucson Gem and Mineral Show, the Las Vegas JCK show, or the Bangkok Gems and Jewellery Fair, a sheet may be valid only for the duration of the event — sometimes as little as five days. In private dealer-to-dealer relationships, a sheet may remain operative for thirty to ninety days, after which it is withdrawn or reissued with revised figures. The issuing party retains the right to withdraw or amend bids at any time before a transaction is concluded, and experienced sellers understand that a bid sheet is an expression of current buying interest rather than a legally binding contract of purchase.
Prices on bid sheets respond quickly to shifts in market conditions: a significant parcel of high-quality Mozambican rubies reaching the market, a change in Thai import duties, or a major auction result that resets expectations for a particular origin can all prompt a dealer to revise figures within days. This responsiveness is precisely what makes bid sheets useful as a barometer of wholesale sentiment, but it also means that a sheet even a few weeks old may no longer reflect current reality.
Role in Trade Shows and Private Dealing
At large trade fairs, bid sheets serve a logistical function as much as a commercial one. A dealer with a buying budget spread across dozens of categories cannot practically examine and negotiate every parcel brought to the booth. Distributing a bid sheet in advance — or posting it visibly at the booth — allows sellers to pre-screen whether their goods fall within the buyer's parameters before investing time in a showing. This benefits both parties: sellers avoid presenting material that is clearly outside the buyer's range, and buyers avoid the social friction of repeated refusals.
In private dealing networks, bid sheets circulate through email, messaging applications, and dedicated trade platforms. Some larger trading houses maintain password-protected portals where registered counterparties can access current bids. The shift toward digital distribution has accelerated since roughly 2015, though the underlying logic of the instrument — a standing, categorised offer to buy — is unchanged from the paper lists that circulated at Antwerp, Bangkok, and New York booths decades earlier.
Bid Sheets and Price Transparency
The coloured-gemstone market has historically been characterised by significant price opacity compared with, say, the diamond market, where the Rapaport Diamond Report provides a widely referenced wholesale price benchmark. No single equivalent publication dominates the coloured-stone trade, which makes dealer bid sheets one of the closest available proxies for real-time wholesale values. A seller who collects bid sheets from several reputable dealers at a given fair gains a reasonable picture of the market's current appetite for a particular category of goods.
This function has not gone unnoticed by appraisers and estate professionals. When valuing a parcel for insurance, estate, or liquidation purposes, a practitioner who can demonstrate that multiple current bid sheets were consulted — and that the valuation reflects those bids rather than retail replacement values — is on firmer methodological ground than one relying solely on published price guides or comparable retail sales. The distinction between fair market value (what a willing buyer would pay a willing seller in the wholesale market) and replacement value (the retail cost of an equivalent item) is fundamental to appraisal practice, and bid sheets are direct evidence of the former.
Limitations and Caveats
Bid sheets have several inherent limitations that users must understand. First, they reflect one dealer's inventory needs and risk appetite at a specific moment; a dealer who is already long on Burmese sapphires may post a lower bid for that category than a dealer who is actively seeking such goods, even if both are operating in the same market. Second, the quality descriptors used are not standardised, so a stone that one dealer would classify as fine another might grade as top commercial, making direct comparison between sheets imprecise. Third, bid sheets typically apply to clean, well-cut, readily tradeable goods; unusual shapes, heavily included stones, or pieces requiring significant re-cutting may not fit any listed category and must be negotiated individually. Fourth, the bids are wholesale figures and do not represent what a private individual could expect to receive when selling a single stone to a retail jeweller, whose own margin requirements will result in a substantially lower offer.
Finally, bid sheets are instruments of a relationship-based trade. A dealer may post a bid publicly but reserve the right to apply stricter quality standards when actually examining goods, or to prioritise long-standing suppliers when inventory is limited. The posted figure is a starting point for a commercial relationship, not a guarantee of execution.