When it comes to choosing premium jewelry or metal for high-end industrial applications, the choice of metal profoundly influences both aesthetics and functionality. Rhodium and platinum are two of the most popular precious metals due to their inherent beauty and useful characteristics.
When choosing any of these metals, understanding ‘Rhodium vs Platinum’ is crucial for investors, collectors, or consumers.
Thus, in the following discussion of rhodium vs platinum, let us delve into the bright and sunny world of these two honorable metals to find out why they rightly deserve such high appreciation.
The Historical Significance of Platinum & Rhodium
The discovery of platinum dates back to the ancient Egyptian civilization over 3000 years ago, though their artwork used platinum alloy with gold. While platinum was known in pre-Columbian times, Europeans only became aware of it in the middle of the eighteenth century when the man of science, Don Antonio de Ulloa, who was a Spanish ‘physician and commissioner of the Admiralty,’ got interested in this metal.
Generally known by the name of the ‘white gold,’ platinum was recognized as a noble metal by the Swede Theophil Scheffer in 1751, and French chemist François Chabaneau later found a way to refine the said metal in 1783. And by 1788, this purified platinum was utilized to develop the distinguished chalice of Pope Pius VI as evidenced.
In the early part of the 1800s, William Hyde Wollaston and Smithson Tennant invented a process that helped to make platinum malleable and, therefore, increased its versatility in various industries. Platinum was discovered in Russia in 1822; however, it was generally used to make ornamental chains, while the use for cufflinks and shirt studs began in the 1850s.
Nevertheless, the high melting point of platinum was a problem when it came to chasing elaborate patterns until the 1890s, when it became acceptable for use in fine jewelry by Cartier and Tiffany & Co.
In the Second World War, the US Government restricted the utilization of platinum except for military use, which created an increased demand for white gold. Platinum re-established its consumer acceptance after the war and currently accounts for around 40 percent of engagement and wedding rings within the United States. The material has retained its beloved and desired qualities of strength and ability to hold the true color of diamonds.
In the discussion of rhodium vs platinum, next comes the history of rhodium. Rhodium was identified by William Wollaston in 1803 with the help of Smithson Tennant, with whom he was in the business of purifying platinum for commercial purposes. They first started by dissolving regular platinum in aqua regia; the resulting residue, black in color, was subsequently extracted by Tennant to get osmium and iridium. Wollaston concentrated on dissolving platinum, which contained palladium as well. After these metals had been precipitated, he was left with a beautiful red solution from which he prepared rose-red crystals of sodium rhodium chloride (Na3RhCl6). Out of these crystals, Wollaston was able to synthesize a small amount of metallic rhodium.
What is Rhodium?
Rhodium is a dense, silvery metallic element with the atomic symbol Rh. Present in different ores, rhodium is expensive since its availability in the market is low, and it falls under the category of noble metals similar to gold and silver. It is a luminous metallic, silvery-white material that may be differently colored from thin gray to black shades according to the particular inks used with it.
Rhodium can reflect as much as 80% of light; thus, it glistens and is used for coatings on jewelry, mirrors, and searchlights. Black rhodium is an alloy of rhodium with other metals and chemicals which gives it a dark hue and can be used to plate other metals like gold and sterling silver. Rhodium has a high melting point and anti-oxidation ability, such as it is stable and has broad applicability.
Its superior chemical characteristics make it suitable for use in plating jewelry, particularly articles of white gold and to offer high wear resistance. Rhodium is also applied as an anti-wear barrier and catalyst in technical devices like telephone repeaters, mirror headlights, pen nibs, and catalytic converters in automobile built-in engines.
What is Platinum?
Platinum is a chemical element with the symbol of Pt and an atomic number of 78; this material is dense, malleable, ductile, highly inhospitable of chemical reactions, and is an economically important precious metal. This metal gets its name from the Spanish word “Platina,” which translates to “little silver.” As much as it is referred to as platinum today, this metal is well known for its high level of corrosion resistance even at extremely high temperatures, making it the noble metal that is often found in its native uncombined state in the alluvial sand.
Platinum has numerous uses in various fields, such as in the manufacturing of automobile catalytic converters, laboratory equipment, electronic components, especially contacts and electrodes, thermometers, dental instruments, and the jewelry hub. Because of its non-reactivity with molten glass, it is used in the glass industry for handling molten glass. Cisplatin, oxaliplatin, carboplatin, etc, are some of the platinum compounds used in chemotherapy. On the other hand, metallic platinum has resistance to corrosion, making its salts usually harmless when in contact with the human body.
In physical form, platinum is shiny, can be drawn into thin wire and rolled into sheets, and has a silver-white color. It is also more ductile than gold, silver, or copper with pure metals, even though it is less malleable compared to gold.
For these reasons, it offers excellent chemical stability coupled with severe resistance to wear and tarnishing and is used in industrial and fine jewelry.
Rhodium vs Platinum
Platinum and rhodium belong to the platinum group metal (PGMs) class as they are valued for their scarcity, resistance to corrosion, versatility, and durability in many industrial uses despite th eir slightly differing qualities and values.
Let’s understand Rhodium vs Platinum in aspect-wise:
- Properties: platinum, with the symbol Pt, is a dense, malleable, ductile, grayish-white metal. This makes it especially resistant to corrosion at high temperatures or at all, which puts it in a category of noble metals. Rhodium, with the symbol Rh, is a chemical element recognized by its characteristic silvery-white color and high reflective index. It is amazingly resistant to corrosion and is the scarcest of the platinum group metals.
- Uses: The uses of platinum include fashion jewelry, the automotive industry, especially exhaust emission control systems, engines, electronics, and technology like hard disk drives and flat screens, and in the medical industry, such as implants like crowns, bridges, and pacemakers. Rhodium is primarily alloyed with other metals and used in jewelry to surface layer other metals such as gold, silver, and other hard-wearing materials. Investors also watch the silver spot price today for insights into market trends. It also plays an important role in the catalytic converters as well as in the synthesis of nitric acid.
- Value: Platinum is a highly valuable metal, the current market price is nearly $1,000 per ounce primarily due to its rarity and widespread usage in industries. Rhodium has a significantly higher value, reaching up to $11600 per ounce, and thus, it is considered to be the most expensive metal.
- Care and Maintenance: Just like other jewelry that is made from platinum and rhodium, these two jewelry items need a lot of care in order to maintain their glint and shine. Platinum should be cleaned with warm, soapy water using a soft brush; however, rhodium-plated jewelry must be handled gently to avoid rubbing off the layer of rhodium.
Conclusion
Though both platinum and rhodium can be categorized as heavy metals and are used in different industrial applications, they differ in their properties and their performance rates in satisfying consumers’ needs.
Interestingly, while platinum is used in a variety of settings and has historical uses in jewelry and industrial products, rhodium stands in a league of its own in terms of value and purpose, which is simply to improve other metals by making them harder and shiny.
Such differential knowledge on ‘Rhodium vs Platinum’ helps inform decisions for investors and consumers wishing to harness the attributes inherent in these precious metals.
