Sales & Marketing
Structured sales, certification and price discovery.
Auctions & Tenders
Sealed-bid auctions and tenders are an established sales mechanism for rough emeralds, providing structured price discovery across different quality categories and buyer groups.
How the Model Works
1. Sorting & Grading
Rough emeralds are classified into parcels according to quality characteristics such as size, colour and clarity.
2. Customer Viewings
Qualified buyers inspect selected parcels through private, in-person viewings.
3. Sealed-Bid Auction / Tender
Buyers submit confidential bids through an online auction platform.
4. Price Discovery
Competitive bidding establishes realised prices for individual parcels and quality categories.
5. Repeat Market Access
Regular auctions provide an established route for producers to access international cutting, trading and jewellery markets.
Industry Evidence — Kagem Emerald Auctions
Auction outcomes vary materially with parcel quality and composition, reinforcing the importance of grading, valuation and disciplined parcel formation before sale. Kagem results are market context only and are not indicative of Menzies emerald prices.
Source: Gemfields Group Limited, 2026 Operational Update and May 2026 Higher-Quality Emerald Auction Results.
Gemstar Mine-to-Market
Gemstar’s objective is to progressively connect Menzies emeralds from mine through grading, certification and structured sales channels to specialist international gemstone markets.
Direct B2B Relationships
Establish direct relationships with qualified gemstone buyers, traders and industry participants, and develop initial pricing benchmarks and buyer feedback.
Structured Tenders
Progressively introduce sealed-bid tender and auction-style sales for selected emerald parcels. Engagement with Bonas Group supports Gemstar’s development of structured emerald tender and international buyer access strategies.
Certification & Provenance
Gemstar is engaging with GUILD Gem Laboratories in relation to independent gemmological testing, product characterisation and certification pathways for Menzies emeralds.
Pricing & Premium
Value Stack Structure
Color, Clarity, Size, Cut, Origin, Certificate
The price of an emerald is primarily built on its "value stack," where color dominates. The most prized stones exhibit a vivid, saturated green hue.
Clarity follows closely, with eye-clean stones commanding a premium. Size and cut further drive rarity, while Origin (like Colombia or Zambia) adds brand-like recognition.
Treatment & Disclosure
None / Minor / Moderate / Significant Enhancement
Almost all emeralds contain surface-reaching fractures. Disclosure of the degree of enhancement is a crucial determinant of value.
Stones with no or minor oil command significant premiums. Full transparency in disclosure is essential to maintain consumer trust and compliance with international gem-trade ethics.
Lab Certification
GUILD, SSEF, Gübelin, GIA, AGL
Gemological laboratories set global standards. Their reports specify geographic origin and treatment level, defining the gem's position within international price bands.
For investors, lab credibility functions as a financial instrument, underpinning pricing transparency and liquidity in the high-end gemstone market.