The International Gold Standard: Purity and Applications in the Gemstone Industry | Gallery posted by moonstone..🌜

# # The International Gold Standard: Purity, Metallurgy, and Applications in the Gemstone Industry

Gold is a precious metal that is naturally soft, rusty-free and tarnish-resistant. In metallurgy and gemology, the production of gold into jewelry or workpieces requires fusing it with other metals (Alloys) to increase its strength, durability and color modification. The proportion of pure gold in this alloy is measured with a * * "carat" system (Karat - K) * *, dividing the proportion of pure gold into 24 parts.

# # # 1.24K Gold (Pure Gold / Fine Gold)

* * * Purity: * * 99.9% or 99.99% (stamped 999, 999.9 or 24K)

* * * Physical properties: * * It is pure gold with no other metals adulterated. It has a natural bright golden yellow. It is perfectly resistant to oxidation, but has hardness (Hardness) limitations. The metal texture is very soft.

* * * Application: * * This level standard is suitable for casting as gold bullion or investment coinage.

# # # 2.Thai Standard Gold (Thai Gold - 96.5%)

* * * Purity: * * 96.5% (approximately 23.16K equivalent)

* * * Physical properties: * * It contains a mixture of other metals (often silver and copper) of 3.5%, giving it a better strength of forming resistance than 24K gold.

* * * Application: * * Popular for making portrait gold jewelry highlighting ancient patterns.

# # # 3.22K Gold (22K Gold)

* * * Purity: * * 91.6% or 91.67% (916 or 22K stamped)

* * * Physical properties: * * Mix other metals 8.33%, make the metal more strong

* * * Application: * * Popular in South Asia and Middle East region

# # # 4.18K Gold (18K Gold)

* * * Purity: * * 75.0% (Stamped 750, 18K or Au750)

* * * Physical properties: * * Steady adhesion to gems, durable to everyday wear

* * * Application: * * Popular in high gem jewelry

# # # Metallurgy and Color Creations of Gold (Gold Alloys & Colors)

Color modification of gold is an important branch art. The color control of the housing can choose the type and proportion of doped metals.

* * * Yellow Gold: * * Pure Gold Mixed with Silver and Copper

* * * White Gold: * * Gold Blend Nickel or Silver

* * * Rose Gold: * * Adding copper causes pink color

* * * Green Gold: * * Mixed gold with pure silver