— Est. 2026, New York

Software for dealers of fine stones.

Inventory, memos, invoices — in one quiet system designed for the coloured-stone trade. Built for houses on 47th Street, in Paris, and in Bangkok.

Try the demo
No signup · seeded with sample inventory · launch the app →
Lumen inventory view
The catalog № 01 · Inventory
Lumen memo tracker
Sent on memo № 02 · Memoranda
Lumen invoices
Paid, on time № 03 · Invoicing

Four movements

of a single dealer's day

№ 01 · Inventory

Every stone, one catalog.

Loose gems, parcels, rough, finished pieces — one record per item with everything a client might ask for.

  • Full spec sheet. 4Cs, shape, origin, treatment, lab cert, stock #, location
  • Four price tiers. Cost (internal), wholesale, preferred, ask — per item
  • Three layouts. Table for density, gallery for clients, board for status at a glance
  • Keyboard-first search. Stock #, cert #, origin, title — press / to focus
  • Bulk actions. Select rows → create memo, edit tags, print labels
  • CSV import. Paste from Sheets, auto-map columns, preview, commit
  • Photos in batch. Drop a folder; filenames auto-match to stock numbers
  • Shopify publish per item when a store is connected
№ 02 · Memoranda

Nothing walks out unlogged.

Safe to Paris and back. Every piece on memo is one click from returning, nudging, or converting.

  • Multi-item composer. Client picker, return-by date, preferred tier pricing
  • Overdue surfaced. Home screen attention list; red/yellow flags in the memo list
  • Nudge. Polite reminder to the client, logged in activity
  • Mark returned. Items flow back to Available instantly
  • Convert to invoice. Carries client, line items, and preferred prices across
  • Automatic ageing. Status flips from Active → Overdue on the due date
  • Boilerplate. Insurance clause and memo terms template, per workspace
  • Lifecycle audit. Activity trail from issue through return or conversion
№ 03 · Invoicing

Drafted, sent, collected.

Draft from inventory or straight from a memo. Lifecycle tracked all the way to paid.

  • Two drafting paths. Start from scratch, or convert a memo in one click
  • Per-client tier. Prices auto-apply wholesale / preferred / retail
  • Tax. Configurable default rate + per-jurisdiction override
  • Stripe-ready lifecycle. Draft → Sent → Paid, every transition recorded
  • Overdue detection. Sent past due date flips to Overdue automatically
  • Send reminder. One-click nudge with a link to the invoice
  • Mark paid → Shopify sold-out. Inventory on the storefront updates automatically
  • Client-ready PDF for email, with your logo, terms, and wire details
№ 04 · Reports

Know what sells and what's stuck.

The view from above — trends, concentrations, operational health, all reconciled from your own records.

  • 12-month sales trend. Revenue, deal count, average ticket per month
  • Sales mix. By category, by origin, by price band
  • Aging buckets. 0–30, 31–60, 61–90, 91–180, 180+ days on the floor
  • Dead stock. 180+ days AND never on a memo — the ones to re-price
  • Top clients. YTD spend, lifetime value, last-order date, conversion rate
  • Dormant list. Clients with no activity in 90 days — your nurture queue
  • Memo health. Conversion %, average issue-to-close duration
  • Receivables. AR aging, DSO, paid-on-time %, outstanding total

Three tiers

Solo

$39/mo
  • — 500 items
  • — 1 seat
  • — Memos & invoices
Start

House

$129/mo
  • — 10,000 items
  • — 8 seats
  • — Accounting sync
  • — Multi-location
Start

Trade

—
  • — Unlimited
  • — Dedicated support
  • — SOC 2, API
Contact