Auction week ahead: Sotheby's, Drouot, and Koller Auktionen

From the calendar desk

This Monday, HammerAlert is tracking 2525 upcoming auctions from 129 houses. 485 sales fall inside the next seven days.

The week ahead is shaped by Sotheby's, Drouot, Koller Auktionen, and Heritage, with modern & contemporary art, jewellery, watches, and design & decorative arts giving the calendar its main shape.

The point is not to reproduce every sale in the database. It is to make the week readable: where the major rooms are active, which collecting fields are clustering, and which dates deserve a place in the diary before the catalogues start to blur together.

Sales to open first

Begin with South Asian Modern + Contemporary Art, Important Watches, and The Gem Drop September. They are the sales most likely to reward an early look because of the house behind them, the field they sit in, or the timing around them.

For each one, open the sale page first, then step back to the house calendar. That is usually where the pattern becomes legible: a jewellery sale sitting beside watches, a design auction framed by modern art, or a regional week gathering several specialist rooms at once.

HammerAlert is still a calendar, not a catalogue raisonné. Estimates, condition, buyer's premium and bidding terms belong with the auction house. What this note does is point to the sales that merit attention before the week gets noisy.

What gives the week its character

At Christie's, South Asian Modern + Contemporary Art, scheduled for 16 September 2026, gives the modern & contemporary art thread a clear sale to open first in London, United Kingdom. At Sotheby's, Important Watches, scheduled for 19 September 2026, gives the watches thread a clear sale to open first in Hong Kong. At Sotheby's, The Gem Drop September, scheduled for 17 September 2026, gives the jewellery thread a clear sale to open first in New York. At Drouot, Design & modern art, session 8-8, scheduled for 18 September 2026, gives the modern & contemporary art thread a clear sale to open first in Netherlands, Amsterdamseweg 23 6814 GA Arnhem, 6814, Arnhem.

Antique and modern paintings, period furniture, objets d’art and home furnishings, primitive art, glassware, silverware, tableware, rugs, modern books, manuscripts, autographs adds another Europe date to compare against the main house calendars. Works of Art & Decorative Arts adds another Europe date to compare against the main house calendars. Teppiche adds another Europe date to compare against the main house calendars. Jewellery adds another United Kingdom date to compare against the main house calendars.

Collectors who follow one field should read sideways. A single watch auction may point to a broader luxury week; a modern art sale may sit beside design, editions or photographs. The value of a shared calendar is seeing those adjacencies at once.

The global agenda

By field, the week is strongest in modern & contemporary art, jewellery, watches, and design & decorative arts.

By geography, the weight sits with United Kingdom, Europe, and United States.

If a field appears across several houses, start by comparing the category page. If one auctioneer dominates the week, the house page is cleaner. The best route depends on whether you are following objects, rooms or geography.

Before the gavel

Use this article as the Monday read, then return to the live calendar as the week changes. Auction houses can add catalogues, shift sessions, extend timed sales or publish viewing details after this note goes out.

For ongoing monitoring, follow the linked house, category and region pages, or create a HammerAlert account to keep the relevant sales in one personal auction calendar.

Open the sales mentioned

These are the live sale and calendar pages behind the note:

• South Asian Modern + Contemporary Art (Christie's, 16 September 2026, Modern & Contemporary Art)
• Important Watches (Sotheby's, 19 September 2026, Watches)
• The Gem Drop September (Sotheby's, 17 September 2026, Jewellery)
• Design & modern art, session 8-8 (Drouot, 18 September 2026, Modern & Contemporary Art)
• Antique and modern paintings, period furniture, objets d’art and home furnishings, primitive art, glassware, silverware, tableware, rugs, modern books, manuscripts, autographs (Drouot, 18 September 2026, Modern & Contemporary Art)
• Works of Art & Decorative Arts (Koller Auktionen, 17 September 2026, Design & Decorative Arts)
• Teppiche (Koller Auktionen, 17 September 2026, Design & Decorative Arts)
• Jewellery (David Duggleby, 17 September 2026, Jewellery)

The week in numbers

These counts come from the live HammerAlert calendar at publication time and give the article its market shape.