Ruby$11,800+1.4%Sapphire$86,000-0.4%Sapphire$11,500+1.8%Emerald$34,000+1.3%Emerald$13,200+2.6%Paraíba Tourmaline$42,000+4.7%Paraíba Tourmaline$13,000+3.1%Spinel$6,200+0.6%Cobalt Spinel$21,000+5.2%
Ruby$11,800+1.4%Sapphire$86,000-0.4%Sapphire$11,500+1.8%Emerald$34,000+1.3%Emerald$13,200+2.6%Paraíba Tourmaline$42,000+4.7%Paraíba Tourmaline$13,000+3.1%Spinel$6,200+0.6%Cobalt Spinel$21,000+5.2%
1.75% EACH SIDEAuction buyers pay around 26%. Ours pay 1.75%. Apply
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BUY · TRADE · VAULT

Trade them like assets.

Custodian Gem Xchange is three things in one place: a shop for direct purchase of certified stones, a marketplace where vaulted stones trade on private offers, and the custodian vault network that holds the physical stone until someone redeems it. Every stone secured in vault custody.

01 · VAULT EXCHANGE

Trade

Trade now

Top-tier certified stones from every major laboratory worldwide, held in insured custody and traded on private offers. Ownership changes hands in minutes while the stone never moves.

  • Offers open
  • Investment grade, top-tier certified
  • Borrow against stones in custody
02 · DIRECT PURCHASE

Buy

Buy now

Certified stones from a small group of vetted sellers, with the enhancement process stated on every listing. Choose a stone and check out.

  • Compare prices and qualities side by side
  • Natural or enhanced, stated on every listing
  • Delivered, or held in vault storage
STONES IN CUSTODY
32
LABORATORIES
4
VAULT LOCATIONS
5
BUYER FEES
0%
TWENTY YEAR VIEW

Scarcity does the work over time. Buying right is what decides whether you benefit from it.

Fine material has held value across decades — the chart shows why. What the exchange offers is access: verified stones, open pricing, and the ability to wait for the right one. The conclusions are yours to draw.

See the market index
Ruby Sapphire Emerald
INDEX · BASE 100
100200300 400500 0510 1520
5Y
+31 / +47%
10Y
+71 / +116%
15Y
+124 / +217%
20Y
+194 / +366%

Illustrative index modelled on published trade estimates of 4–8% average annual appreciation for fine material over recent decades. Individual stones vary enormously. Not a forecast, and not investment advice.

01 / PROBLEM

Selling precious stones still runs on trust and handshakes

01

The buyer cannot verify without holding

A certificate proves something about a stone, but only if the stone in the photograph is the stone in the envelope. Until it is in your hand, you are trusting the seller’s word that the two match.

WITH CUSTODYThe stone is matched to its report on intake, and the report is checked against the issuing laboratory before it is ever listed.
02

The seller cannot release without payment

Send first and hope, or demand payment first and lose the sale. Between two dealers who have never met and share no jurisdiction, this is where most cross-border trades die.

WITH CUSTODYFunds sit in escrow — held by a neutral third party that belongs to neither side — and are released to the seller only once ownership has transferred.
03

Moving the stone makes most trades not worth doing

Shipping, insurance, customs clearance, a week in transit and a real risk of loss. Stack those costs against the spread and any trade under roughly 15% margin stops being worth doing at all.

WITH CUSTODYOwnership transfers while the stone stays where it is. It only moves when its owner decides to redeem it.
02 / VAULT

Secured, certified, and on the market

View all · 32
Mozambique Ruby, no heatNo offers yetNO HEAT
Mozambique Ruby, no heat
LOCATIONMontepuez, Mozambique
COLOURDeep red
CUTCushion
4.12 CTNO HEATGRS
ASKING PRICE
$50,300
$12,209 / ct
Offers open
Buy now Make offer
Kashmir Sapphire, cornflower3 privateNO HEAT
Kashmir Sapphire, cornflower
LOCATIONKashmir
COLOURCornflower blue, velvety
CUTCushion
3.02 CTNO HEATSSEF
ASKING PRICE
$174,000
$57,616 / ct
3 offers active
Buy now Make offer
Colombian Emerald, vivid2 privateNO OIL
Colombian Emerald, vivid
LOCATIONMuzo, Colombia
COLOURVivid green
CUTOctagon
3.14 CTNO OILSSEF
ASKING PRICE
$94,200
$30,000 / ct
2 offers active
Buy now Make offer
Paraba Tourmaline, neon4 privateNATURAL
Paraíba Tourmaline, neon
LOCATIONParaíba, Brazil
COLOURNeon blue-green
CUTOval
1.76 CTNATURALGRS
ASKING PRICE
$54,600
$31,023 / ct
4 offers active
Buy now Make offer
03 / STANDARDS

Two venues, two standards

Apply for access
VAULT STANDARD

Natural, untreated, top-tier certified

Traded on private offers. Verified on intake before it reaches the board.
01Natural and untreated. Certificate must state no treatment detected.
02Top-tier certification. GRS, SSEF, Gübelin, or AGL.
03Declared value from $10,000.
04Size by species. Ruby from 2 ct, sapphire and emerald from 3 ct.
05Origin-significant material.
SHOP STANDARD

Enhanced and commercial material

Fixed price from vetted sellers, enhancement stated on every listing.
01Heated ruby and sapphire
02Oiled or resin-filled emerald
03Diffusion-treated material
04Fracture-filled stones
05Commercial-laboratory reports
04 / CUSTODY

How the vault works

Vault Facility
01

Verify first

Before anything is shipped, send us the laboratory report. We check it against the issuing laboratory’s own register and confirm the stone meets the vault standard. You know it qualifies before it leaves your safe.

02

Deposit

Once verified, send the stone to the Bangkok headquarters vault. On arrival it is weighed, measured and matched against the report it was verified on, then placed in insured storage under your name.

03

List and trade

Your stone appears on the board at your asking price. Buyers accept it outright or open a private offer, and ownership can change hands any number of times while the stone stays exactly where it is.

04

Redeem, whenever you want

Whoever owns the stone controls it. Leave it in custody indefinitely and keep trading it, collect it in Bangkok after a final inspection, or have it moved under insured chain of custody to a partner facility near you. No lock-in and no notice period.

Bangkok
HQ · OPERATING
Hong Kong
PARTNER
Dubai
PARTNER
Antwerp
PARTNER
New York
PARTNER
05 / TERMS

What it costs to vault and trade

Fees
COMMISSION
1.75%

Each side

Charged on sale, never to the buyer.

STORAGE
Free

While actively listed

No cost for as long as your stone is listed and available. Delisted or dormant beyond 90 days, storage is charged at 0.5% of declared value per year.

INSURANCE
Included

In storage and in transit

Every vaulted stone is insured while held and while moving between facilities, up to a value agreed in writing at intake.

06 / BUY

Certified stones, buy outright

View all · 40
Blue Sapphire, heatedHEATED
Blue Sapphire, heated
LOCATIONSri Lanka
ENHANCEMENTHeated
LABORATORYGIA
1.85 CTHEATEDGIA
PRICE
$1,240
Buy now Make offer
Zambian Emerald, minor oilMINOR OIL
Zambian Emerald, minor oil
LOCATIONKagem, Zambia
ENHANCEMENTMinor Oil
LABORATORYIGI
2.10 CTMINOR OILIGI
PRICE
$890
Buy now Make offer
Ruby, heatedHEATED
Ruby, heated
LOCATIONMozambique
ENHANCEMENTHeated
LABORATORYGIA
1.90 CTHEATEDGIA
PRICE
$1,450
Buy now Make offer
Pink TourmalineNATURAL
Pink Tourmaline
LOCATIONMozambique
ENHANCEMENTNatural
LABORATORYAIGS
3.06 CTNATURALAIGS
PRICE
$700
Buy now Make offer
07 / INTELLIGENCE

What is moving the market

Market
SUPPLY12 AUG 2026

Montepuez suspends two pits for scheduled reassessment

Operations at two of the Mozambican ruby concession’s working pits have paused pending a geological review, with output guidance for the second half revised downward.

TRADE PRESS
RECORD28 JUL 2026

Kashmir sapphire ring clears half a million at auction

A 12.36 carat cushion-cut Kashmir stone, unheated and certified, underlined sustained demand for material from the exhausted Himalayan deposit.

AUCTION RESULT
SUPPLY03 JUL 2026

New copper-bearing tourmaline occurrence reported in Nigeria

Early parcels show colour approaching Mozambican material. Laboratories are updating origin criteria before the stones reach volume trade.

FIELD REPORT
STANDARDS19 JUN 2026

Laboratories tighten disclosure language on emerald clarity grades

Revised reporting standards narrow the definitions of minor and moderate enhancement, with implications for stones certified under earlier criteria.

LABORATORY NOTICE
08 / TRUST

Built so no one trades on trust alone

Why CGX
TOP-TIER LABS

Certification checked at source

GRS, SSEF, Gübelin and AGL reports are cross-checked against the issuing laboratory and matched to the physical stone before listing.

ESCROW + CUSTODY

Payment tied to the vault

Funds are held in escrow until the stone is verified into custody. Sellers are paid on confirmed intake, not on trust.

PRIVATE BY DEFAULT

Offers stay between the parties

Only the seller sees offer amounts. Other buyers see interest, never numbers — your position is never exposed to the market.

1.75% EACH SIDE

Auction buyers pay around 26%. Ours pay 1.75%.
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