An 18.63 carat cornflower-blue Ceylon sapphire, cushion cut, on black velvet

Coloured stones,
direct from origin.

Sapphire, ruby, emerald, spinel and rarer material — bought at source, cut to our own specification, placed with reports from AGL, GRS, SSEF or Gübelin.

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I.   The stones

Four species, and what is rarer.

Bought at source, cut to specification, certified where the stone warrants it. Treatment, origin and grade are never withheld or softened in listing copy.

01

Sapphire

Corundum

Blue, pink, yellow, padparadscha and fancy colours. Principally Sri Lanka and Madagascar; Burma and Tanzania for specific colours; Montana for calibrated cornflower material; Australia for deep-blue and parti goods. Kashmir on availability only.

Overhead — the 18.63 ct cornflower Ceylon.

TreatmentHeated or unheated, disclosed
Typical size1.0 – 15.0 ct
Origins workedSri Lanka · Madagascar · Burma · Tanzania · Australia · Montana · Kashmir
Oval-cut unheated pigeon's-blood ruby from Mozambique on black velvet
3.15 ct unheated pigeon's-blood — Mozambique
Corundum — Mozambique · Burma

Ruby.

Pigeon's-blood is the laboratory's word — never ours alone.

Treatment
Heated or unheated, disclosed
Typical size
0.5 – 8.0 ct
Origins worked
Mozambique · Burma
Treatment, origin and grade are taken from the report — never on our word alone.
Desk policy
Emerald-cut Muzo-green Colombian emerald with visible jardin on black velvet
4.27 ct Muzo green — Colombia
Beryl — Colombia · Zambia

Emerald.

Muzo and Chivor designations; the jardin left to speak.

Treatment
Oil disclosed — none to significant
Typical size
0.5 – 10.0 ct
Origins worked
Colombia (Muzo · Chivor) · Zambia
VI
Origins worked
IV
Laboratories on call
V
Buying offices
I
Book of record
Cushion-cut pinkish-red Mahenge spinel on black velvet
4.52 ct Mahenge spinel — Tanzania
Magnesium aluminate — Mahenge · Mogok · Kuh-i-Lal

Spinel.

Unheated as a rule — spinel rarely warrants treatment.

Treatment
Untreated as standard
Typical size
1.0 – 8.0 ct
Origins worked
Tanzania (Mahenge) · Burma (Mogok) · Tajikistan
05

Rare & one-off.

Held on availability

Paraíba tourmaline, alexandrite, demantoid garnet, tsavorite, jadeite — and Kashmir sapphire when it appears. Single-stone trades, dossier per stone, no parcels.

TreatmentPer stone, on report
Typical sizePer stone
Origins workedBrazil · Russia (Ural) · Burma · Madagascar · Mozambique
The laboratories
AGL
New York
GRS
Lucerne
SSEF
Basel
Gübelin
Lucerne
GIA
Carlsbad
Lotus
Bangkok
II.   The trade desk

Brief the desk.

Reply within two working days. Material viewings in Bangkok, Colombo, Antwerp and by arrangement in Singapore.