GB/T 32863-2016 in English

VALID

Ruby grading

Issued on:2016-08-29
Implemented on:2017-03-01
File Format:PDF
Delivery:Within 1 day

Price(USD)： $176.00
$171.00

Standard No:	GB/T 32863-2016
Document status:	VALID
Title in English:	Ruby grading
Title in Chinese:	红宝石分级
Language:	English
File Format:	Electronic (PDF)
Delivery:	Within 1 day
Issued on:	2016-08-29
Implemented on:	2017-03-01
ICS Classification:	39.060-Jewellery
Chinese Classification:	D59-Other non-metal ore
Professional Classification:	GB-National Standard
Related Keywords:	introduction introduction gb/t32863-2016 ruby grading national standard fire grading fire level crown area ratio brightness characteristics excellent ruby grading unified standard
Related Topics:	ruby precious Baohua gem Paine Ruby gem machine Talc Pink Analysis gem design red treasure how red treasure laser ruby gemstone GBT32863 GB/T 32863-2016 power Bank Wang Baorui baby playpen

《GB/T 32863-2016红宝石分级》由TC298（全国珠宝玉石标准化技术委员会）归口，主管部门为自然资源部(国土)。

Introduction

GB/T32863-2016 Ruby Grading National Standard is one of the important specifications of my country's jewelry and jade industry, which aims to provide a scientific basis and unified standard for the grading of natural rubies. This article will provide an in-depth interpretation from multiple dimensions such as standard background, technical framework, and implementation suggestions.

Background and Significance of Standard Formulation

As a precious gem variety, the value of ruby mainly depends on factors such as color, clarity, and fire. However, due to the uneven quality of rubies in the market, a unified standard is urgently needed to regulate the evaluation system. GB/T32863-2016 fills this gap and provides important technical support for the jewelry industry.

Interpretation of key technical points

Color grading

Hue category	Chroma level	Division rules
Red (R)	Dark Red (dRed)	C≥90%, rich and saturated color.
Purple Red (pR)	Vivid Red (vRed)	80≤C<90%, rich and saturated color.

Clarity Grading

The clarity of rubies is divided into four levels, from high to low:

Extremely Pure (C1): Internal features are difficult to detect.
Clean (C2): A small number of internal features, with little impact.
Relatively Pure (C3): Features are visible to the naked eye, with some impact.
Fair (C4): Features are obvious, seriously affecting the appearance.

Fire Grading

Fire Level	Crown Area Ratio	Brightness Characteristics
Excellent (B1)	≥70%	Overall bright and sparkling.
Very Good (B2)	50~70%	Mostly bright and sparkling.

Implementation suggestions

Precautions in practical application

Grading environment:Ensure that there is no direct sunlight and the background is white or neutral gray.
Staff requirements:Grading personnel must receive professional training and must be completed independently by at least 2 technicians.
Equipment selection:Use a light source with a color temperature of 4500K~5500K and a color rendering index of no less than 90.

More samples: GB 50021-2001(2009) JC/T 2453-2018 NB/T 47013.2-2015

Sample only — not a preview of GB/T 32863-2016