Harder platinum alloy?

[Icom]

Hi, I am about to buy my wedding bands made with platinum ( I decided this after reading some posts about platinum) but I am concern about the softness of some alloys. I read in the site of Diamonds Unlimited http://www.diamondsunlimited.com/platinum_alloy_mixes.html
that they use a harder platinum alloy they call it Plat-S-1,2™ . They say that that alloy can reach a 300 HV (Hardness is measured by the Vickers scale), and if you compare it with the 80 HV from the 95%Platinum 5% Iridium, sounds like a good choise. Have anyone heard about this alloy, the Diamonds Unlimited Site or have you deal with them?

Thanks.

 

[pricescope]

I made a search on Google and found a few articles on Plat/S+1 and Plat/S+2.

For instance (http://www.ajm-magazine.com/ntm/archives/platfeb.html):

Several heat-treatable alloys on the market today are proprietary in nature, and their contents have not been disclosed. Two of these systems are Plat/S+1 and Plat/S+2, both formulated by Steven Kretchmer of Steven Kretchmer Design in Palenville, New York. Starting with a Vickers hardness ranging from 135 to 145 and 170 to 200, respectively, these alloys can be heat treated to reach a hardness of 252 (S+1) and 306 (S+2). They can be cast, preferably by induction or with a hydrogen/oxygen torch, and have a melting range of 1,600°C to 1,640°C. Because of their lower melting temperatures, sizing should be done with a 1,500°C solder.