Alexandra Cheney

Watchmakers use the material in both its glass and mineral forms.

Some collectors prefer the aesthetics and design of a beautiful timepiece that you can set on a table — “a mechanical sculpture,” as one put it.

Fans say the devices provide benefits, including help with lubrication, but detractors say overuse can cause damage.

“There’s certain jewelry that, if you know, you can recognize it in a second,” a retailer said.

Fans of the tastemaker Paola Russo find what they’re looking for at her Los Angeles shop, called Just One Eye.

The stones in the teeth of Post Malone, Odell Beckham Jr. and other celebrities were put there by Dr. Thomas Connelly, a Los Angeles dentist.

And at least one specialist goes even further: “Old Gucci shoe box, great! We can turn that into an accessories box.”

Women’s competitive surfing has grown markedly in recent years, attracting support from brands such as Tudor and TAG Heuer.

As one artist wrote: “Luxury is not found in the cold pixels of our phone or computer.”

What do you pack? How many watches do you bring? Everyone from first-time invitees to veterans agree that this trade show requires planning.