This alloy is more durable, scratch resistant, and expensive than the common Platinum/Iridium blends. Because the Platinum 950 Ru is harder to cast, many of our competitors favor the Iridium alloys. Platinum 950 Ru has a slightly higher Vickers hardness rating than platinum with iridium (135 vs 80 assuming 5% alloy). Platinum is commonly alloyed with iridium or ruthenium to make up the other 5 to 10% of the ring. Because these alloys are both precious metals in the platinum metal group, platinum is hypoallergenic and ideal for anyone with sensitive skin.