GB/T 35940-2018Seawater cultured pearl oysters and classification of pearls (English PDF)
海水育珠品种及其珍珠分类
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 35940-2018 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
February 6, 2018
Implementation date
September 1, 2018
Scope
GB/T 35940-2018 is the English-translated version of 海水育珠品种及其珍珠分类.
GB/T 35940-2018 sets out the terms, varieties and classification used for seawater pearl oyster culture and the pearls it produces. It covers the varieties of seawater cultured pearl oysters, the categories of seawater pearls and the rules for naming them.
The definitions include the seawater pearl oyster itself, the mantle tissue piece cut from the oyster for grafting, the nucleus, and free, nucleated, non-nucleated and natural non-nucleated seawater pearls.
It builds on GB/T 16552 for jewellery and jade names, GB/T 16553 for identification, GB/T 18781 for pearl grading and SC/T 2071. The standard applies to identifying seawater pearls and to their classification and naming. It was issued on 6 February 2018 and has applied since 1 September 2018.
Found what you need?
Document preview — GB/T 35940-2018
National Standard of the People's Republic of China
- ICS
- 67.120.30; 39.060
- Classification
- B 51
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard stipulates the terms and definitions of marine pearl oyster culture and its pearls, seawater cultured pearl oyster varieties, seawater pearl categorization, and the life of seawater pearls. Rules of the name.
This standard applies to the identification of seawater pearls and the classification and naming of seawater pearls.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 16552 name of jade jewelry
GB/T 16553 jewellery jade identification
GB/T 18781 pearl grading
SC/T 2071 Martensite Beads
3 Terms and Definitions
The following terms and definitions as defined by GB/T 16552, GB/T 16553 and GB/T 18781 apply to this document.
3.1 Seawater cultured pearl shell
Shellfish used for the cultivation of seawater pearls include mainly pearl oysters, pearl oysters, pearl oysters and penguin pearls.
3.2 Mantle tissue piece
A small piece of square tissue was cut from the seawater-incubating pearl shell mantle (close to the outer edge) as a material.
3.3 Nucleus
Used to cultivate the kernel of the shelled pearl.
3.4 Seawater free pearl
In the sea pearls pearls in the shellfish.
3.5 Seawater nucleated pearls
The pearl nucleus is implanted in the seawater-enriched pearl shell and pearls are formed on the surface of the pearl nucleus and secrete nacre.
3.6 Seawater seedless pearl
Pearls derived from seawater secrete pearls that are attached to the surface of implanted cells.
3.7 Natural Seawater Seedless Pearl
The pearls formed by stimulating foreign bodies that occasionally enter the body of sea-breeding pearls.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
How to Download GB/T 35940-2018
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 16552-2017 — Gems - Nomenclature
GB/T 16553-2017 — Gems - Testing
GB/T 18781-2023 — Cultured pearl grading
Secure payment via Stripe
Payments accepted
GB/T 35940-2018
$85.00