The Royal Peacock logo is the certification trademark of Thai silk standards under The Queen Sirikit Institute of Sericulture, Office of the Permanent Secretary, Ministry of Agriculture and Cooperatives. The logo is registered in 22 countries and certifies that the silk bearing the logo conforms to the defined standards. All silk certified with the Royal Peacock logo must be produced in Thailand.

The standards define four grades of silk fabric: gold, silver, blue, and green. These grades emphasise the quality of raw materials and processes used in producing the silk.

All silk certified under these standards is inspected by a registered government inspector and a numbered seal is placed at every meter along the length of the fabric.

Gold – Royal Thai Silk

Silk products made from native silk worms in both the warp and the weft. They may be decorated with not more than 20% of silver or gold threads.

Weaving process: The silk must be hand-spun using simple folk tools. The thread has to be graded after its reeling process, and woven with a wooden hand-loom.

Silver – Classic Thai Silk

Silk products made from native silk worms or hybrids (imported silk worms developed in Thailand) in either the warp or the weft thread. They may be decorated with not more than 20% of silver or gold threads.

Weaving process: The silk must be hand-spun and woven with a wooden hand-loom.

Blue – Thai Silk

Silk products made from native or modified silk worms for both the warp and the weft thread. Those using foreign silk threads must be clearly indicated on the products. They may be decorated with not more than 20% of silver or gold threads.

Weaving process: No restrictions on the reeling and weaving processes.

Green – Thai Silk Blend

Silk products made from native silk worms as a main source of materials with other fabrics as complimentary components. The proportion must be clearly indicated on the products. Other decorative materials can be used.

Weaving process: No restrictions on the reeling and weaving processes.

Source: www.qsds.go.th