Metals & Alloys

Au 417‰ Gold alloys 10k Gold 10 karats, 417ÔÇ░ Density 11.60 g/cm³ Hardness 170 HV Melting 780–820 °C Allergy risk Tarnish: good Au 585‰ Gold alloys 14k Gold 14 karats, 585ÔÇ░ Density 13.10 g/cm³ Hardness 150 HV Melting 802–882 °C Partial risk Tarnish: very good Au 750‰ Gold alloys 18k Rose Gold 18 karats, 750ÔÇ░ Density 15.20 g/cm³ Hardness 170 HV Melting 885–970 °C Partial risk Tarnish: very good Au 750‰ Gold alloys 18k White Gold 18 karats, 750ÔÇ░ Density 15.00 g/cm³ Hardness 135 HV Melting 1000–1100 °C Partial risk Tarnish: excellent Au 750‰ Gold alloys 18k Yellow Gold 18 karats, 750ÔÇ░ Density 15.50 g/cm³ Hardness 125 HV Melting 880–1010 °C Hypoallergenic Tarnish: excellent Au 916‰ Gold alloys 22k Gold 22 karats, 916ÔÇ░ Density 17.70 g/cm³ Hardness 60 HV Melting 890–940 °C Hypoallergenic Tarnish: excellent Au 9,999‰ Gold alloys 24k Gold, Fine Gold 24 karats, 999.9ÔÇ░ fine Density 19.32 g/cm³ Hardness 25 HV Melting 1064 °C Hypoallergenic Tarnish: excellent Au 375‰ Gold alloys 9k Gold 9 karats, 375ÔÇ░ Density 11.00 g/cm³ Hardness 185 HV Melting 770–790 °C Allergy risk Tarnish: moderate Au 375‰ Gold alloys 9k White Gold 9 karats, 375ÔÇ░ Density 10.50 g/cm³ Hardness 200 HV Melting 850–900 °C Allergy risk Tarnish: good Ag 935‰ Silver alloys Argentium Silver 935ÔÇ░, Argentium alloy Density 10.30 g/cm³ Hardness 100 HV Melting 900–950 °C Hypoallergenic Tarnish: very good Ag 958‰ Silver alloys Britannia Silver 958ÔÇ░, Britannia standard Density 10.45 g/cm³ Hardness 65 HV Melting 945–960 °C Hypoallergenic Tarnish: moderate Cu-Sn Base metals Bronze Copper-tin alloy, typically 85ÔÇô95% copper Density 8.80 g/cm³ Hardness 100 HV Melting 1000–1080 °C Allergy risk Tarnish: moderate Cu 9,990‰ Base metals Copper Pure copper or high-copper alloy Density 8.96 g/cm³ Hardness 35 HV Melting 1085 °C Allergy risk Tarnish: poor Ag 9,990‰ Silver alloys Fine Silver 999ÔÇ░, fine silver Density 10.49 g/cm³ Hardness 25 HV Melting 961–962 °C Hypoallergenic Tarnish: poor Nb Specialty metals Niobium Pure niobium or high-purity alloy Density 8.57 g/cm³ Hardness 110 HV Melting 2477 °C Hypoallergenic Tarnish: excellent Pd 500‰ Palladium Palladium 500 500ÔÇ░ Density 10.50 g/cm³ Hardness 100 HV Melting 1380–1450 °C Hypoallergenic Tarnish: very good Pd 950‰ Palladium Palladium 950 950ÔÇ░ Density 12.00 g/cm³ Hardness 110 HV Melting 1535–1555 °C Hypoallergenic Tarnish: excellent Pt 850‰ Platinum group Platinum 850 850ÔÇ░ Density 19.50 g/cm³ Hardness 120 HV Melting 1650–1720 °C Hypoallergenic Tarnish: excellent Pt 950‰ Platinum group Platinum 950 950ÔÇ░, the jewellery standard Density 21.10 g/cm³ Hardness 135 HV Melting 1700–1770 °C Hypoallergenic Tarnish: excellent Rh Plating Platinum group Rhodium (Plating) Pure rhodium, applied as electroplate Density 12.41 g/cm³ Hardness 800 HV Melting 1964 °C Hypoallergenic Tarnish: excellent Fe Titanium & steel Stainless Steel 316L 316L, surgical/marine grade Density 8.00 g/cm³ Hardness 180 HV Melting 1375–1400 °C Partial risk Tarnish: excellent Ag 925‰ Silver alloys Sterling Silver 925ÔÇ░, sterling standard Density 10.36 g/cm³ Hardness 90 HV Melting 893–940 °C Hypoallergenic Tarnish: moderate Ti Titanium & steel Titanium Grade 23 (Ti-6Al-4V ELI) Aerospace grade alloy, Ti-6Al-4V ELI Density 4.43 g/cm³ Hardness 340 HV Melting 1604–1660 °C Hypoallergenic Tarnish: excellent WC Specialty metals Tungsten Carbide Sintered carbide composite Density 15.20 g/cm³ Hardness 1600 HV Melting 2600–2870 °C Partial risk Tarnish: excellent Au/Ag Plating Gold alloys Vermeil (Gold-Plated Sterling Silver) Sterling silver base with gold plating (minimum 10k, 2.5 microns in the US) Density 10.40 g/cm³ Hardness 90 HV Melting 893–940 °C Hypoallergenic Tarnish: good