No new dated, realized print landed this week. Every index row holds.

The news is about the ground, not the price. On October 20, Mozambique's president said the state will hold 20 percent of mining projects through a new national mining company. Mozambique is where Gemfields mines the rubies it sells at auction, and nobody has yet said whether the rule reaches that mine.

Key Takeaways

→ Mozambique raises the number. Speaking in Nacala on October 20, President Chapo said the new state-owned National Mining Company would hold 20 percent of mining projects. The same day, the government signed $4.2 billion in investment memorandums for mineral processing, including graphite and copper (Trade Finance Global).

→ The floor was set in June. The mining law Chapo signed in June requires a free-carried, non-dilutable state stake of at least 15 percent in mining ventures, plus local-processing and export rules (King & Spalding; Mining Weekly).

→ Montepuez is in the frame, not yet in the text. Montepuez Ruby Mining is 75 percent owned by Gemfields and 25 percent by its Mozambican partner Mwiriti. JCK asked Gemfields whether the rules could affect the mine and had no answer by press time. The government has not said whether existing operations are covered.

→ Saffronart, no results yet. The October 21–22 online sale in India listed Kashmir sapphires, Burmese rubies and Colombian emeralds. We found no published results we could verify, so nothing enters the index.

→ Hong Kong posts its catalogue. Christie's announced the lineup for its November 24 Magnificent Jewels sale, led by a Cartier ring set with a 21.05-carat Kashmir sapphire (Rapaport). Estimates are not prices. Details under What We're Watching.

The index tracks the 8 reference stones every week. Each row holds until a new dated transaction moves it. No row moves this week.

Auction prices realized, not retail. Sources: Christie's, Sotheby's, Gemfields, Bonhams, GemGuide, Pala International.

Notable this week: the ruby row carries a "policy watch" flag. The price behind it has not changed. The ownership rules around its source might.

The announcement. On October 20, Mozambique said its new National Mining Company would hold 20 percent of mining projects. In June, the law had set the floor at 15 percent, free-carried and non-dilutable (Club of Mozambique; King & Spalding).

What "free-carried" means. The state gets its stake without paying for it, and the stake is not diluted when the company raises money. The other shareholders fund the mine; the state keeps its percentage.

Why it touches rubies. Every Gemfields ruby auction sells rough from one mine, Montepuez, in Cabo Delgado province. Our index ruby row comes from that auction. Today the ownership split is Gemfields 75 percent, Mwiriti 25 percent.

What a stake does not mean. A 20 percent stake does not hand the state 20 percent of the rubies or of the auction money. What the state receives depends on profits and on contract terms (Trade Finance Global analysis).

What we cannot see. Which projects are covered. Whether mines under existing long-term agreements, like Montepuez, are included. How the 15 percent law and the 20 percent figure fit together. When any of it takes effect. Until the regulations say so, there is no price effect to report.

1. One mine, one auction, one row. When a single mine feeds a whole auction series, its ownership is part of the price story. Watch it like you watch the carats.

2. Read the regulation, not the speech. 15 or 20, new projects or all of them: the answer sits in the implementing text, which has not been published.

3. Policy moves supply before it moves price. If anything changes, it shows first in auction calendars and offered carats, then in averages.

→ The implementing regulations in Mozambique. Specifically, whether existing mines are covered.

→ Gemfields' statement. Any regulatory news on Montepuez would come by RNS.

→ Gemfields' December Trade Select ruby auction. The next test of the new lower-quality format, and of whether the $66 June print was typical.

→ Christie's Hong Kong, November 24. A 21.05-carat Kashmir sapphire Cartier ring is estimated at up to $6.4 million. At the high estimate that is about $304,000 per carat, more than twice our sapphire row (our arithmetic). The catalogue also lists a 5.03-carat Burmese ruby ring at $1.3–1.8 million and an 18.20-carat Colombian emerald ring at $710,000–1.1 million (Rapaport). We report results, not estimates.

→ Sotheby's Geneva online fine jewelry sale, October 30 – November 13. A possible source of dated prints before the Hong Kong sales.

Pick one stone you own or want, and find out which mine or region it most likely came from, and who controls that ground. Origin on a lab report tells you where. Ownership tells you who decides how much comes out next.

— Carat Brief

Carat Brief is editorial. Nothing here is investment, legal, or tax advice. Gemstones are illiquid and require certified verification before purchase. Work with credentialed labs: GIA, AGL, SSEF, Gübelin, Lotus Gemology.

Sources: Club of Mozambique (Chapo announces 20% state stake, October 2026); Trade Finance Global (Mozambique looks to raise state mining stake to 20%, October 2026); JCK (Mozambique rubies, Gemfields, October 22, 2026); King & Spalding (Mozambique mining law, 2026); Mining Weekly (15% state stake rule, June 4, 2026); Rapaport (Christie's predicts $6M payday for Cartier sapphire ring, October 20, 2026); Gemfields; Saffronart sale listing via GJEPC Solitaire. Derived figures are marked as our arithmetic.