2021.07.15
Gold and Platinum

One of the big differences between gold and platinum is their reserves and yields.  Originally, precious metals are natural resource such as gold and platinum which are the limited amount on the earth.  Platinum is extremely rare, with a mining volume of about 1/34 in Gold.

 Their uses are slightly different.  While most gold is used into jewelry, platinum is increasingly used in industrial applications.

 Gold

 Gold is the most malleable and ductile metal.

For example, 1g of gold can be stretched up to 3000 meters and made into gold leaf or gold thread. Pure gold is not suitable as a jewelry because of its malleability.  Generally, it is processed by mixing with silver or copper into an alloy.

 [K18]

 Most gold accessories in Japan have “K18” engraved on the surface.  K is an abbreviation for Karat, which indicates the purity of gold (24 carats is pure gold).  In other words, K24=100% purity so K18 means that 18/24 used 75% gold.

 24 Gold＝K24＝Pure Gold

22 Gold＝K22＝91.7％

20 Gold＝K20＝83.3%

18 Gold＝K18＝75%

14 Gold＝K14＝58.5％

10 Gold＝K10＝41.6%　　

 

The difference between “K18” and “18K” would be country of origin. The most of K18 items are made in Japan and on the other hand many of 18K are made in other Asian countries like China.

Those 18K gold called ‘back K’ in Japan have possibility to have lower gold content than the notation.

 

Gold and platinum both are originally soft and supple, so it is common to be alloyed with other metals .  In particular, gold changes its color depending on the type and blending ratio of mixed metals, so there are color variations such as yellow gold, white gold, pink gold, and green gold.

K18 Jewellery

It is made of a material that does not easily change over time, and even scars and stains that have aged over time can be enjoyed. But it does not mean that the color does not change at all.

We recommend you daily maintenance to wipe it with soft cloth.