Assembled gem products
Products made of two or more parts bonded or otherwise combined, such as doublets, triplets and composites.
What this family is
Every component has to be named with equal prominence when a doublet crosses the counter. A garnet-topped doublet is a thin natural garnet crown fused to a glass pavilion, not a natural garnet. An opal mosaic is small fragments arranged in a pattern rather than one stone, and mabe is an assembled cultured blister whose dome, filling and mother-of-pearl backing must be disclosed.
Scope of this family
Products made of two or more parts bonded or otherwise combined, such as doublets, triplets and composites.
CIBJO definitions
- Bonding
the cohesion of two or more parts or layers. See composite stones clause 5.18.
CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §5.10, p.21
the cohesion of two or more parts or layers. See composite pearl or cultured pearl definition 5.12.
CIBJO Blue Book — Pearl Book (Pearl Commission 2024-1) (CIBJO): §5.29, p.25
the cohesion of two or more parts or layers. See composite products (5.26).
CIBJO Blue Book — Coral Book (Coral Commission 2024) (CIBJO): §5.16, p.12
The books word this differently; each wording is given with its source.
- Doublet
a composite stone consisting of two parts.
CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §5.26, p.22
a composite coral consisting of two parts.
CIBJO Blue Book — Coral Book (Coral Commission 2024) (CIBJO): §5.34, p.14
The books word this differently; each wording is given with its source.
- Triplet
a composite stone (5.18) consisting of three parts.
CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §5.84, p.28
a composite stone (5.26) consisting of three parts.
CIBJO Blue Book — Coral Book (Coral Commission 2024) (CIBJO): §5.98, p.21
The books word this differently; each wording is given with its source.
- Artificially produced composite pearl or cultured pearl
product composed of two or more previously separate parts or layers, assembled by bonding (5.29) or other artificial methods of which at least one is a natural pearl or a cultured pearl.
CIBJO Blue Book — Pearl Book (Pearl Commission 2024-1) (CIBJO): §5.12, p.23
- Composite products
artificial products (5.5) composed of two or more previously separate parts or layers assembled by bonding or other artificial methods. Their components may be natural and/or artificial but at least one part must be coral.
CIBJO Blue Book — Coral Book (Coral Commission 2024) (CIBJO): §5.26, p.13
Entries in the source that only point to another clause: Assembled (§5.13, p.23) → §5.12 Artificially produced composite pearl or cultured pearl; Three-quarter composite cultured pearl (§5.199, p.45) → §5.12 Artificially produced composite pearl or cultured pearl; Assembled coral (§5.7, p.11) → §5.26 Composite products
Definitions are quoted verbatim from the cited CIBJO Blue Book; […] marks an excerpt, and the full definition is at the cited clause.
Member entries (8)
Where members are recorded
Some member entries record the localities where their materials are found; Recorded localities shows them on a sketch map and lists them by continent.
Names
- 简体中文
- 拼合宝石产品
- 繁體中文
- 拼合寶石產品
- English
- Assembled gem products
- 日本語
- アッセンブルド・ストーン製品
Authority source
- Authority source
- Review status
- Reviewed against CIBJO, GB/T and IMA boundaries.
Shared classification
All 8 members share these values:
- Origin class
- Artificial products / Manufactured products
- Material domain
- Artificial products / Manufactured products
- Identity level
- Artificial product type
- Mineral chemical class
- Mixed / composition-dependent
- Construction or treatment status
- Assembled / composite product