Hello, Trapiche and so big and there seems to be a sensible price ,,, are you doing jewelery too, or is it to collect all the gems or special varieties of them more rarer varieties, Trapiche's not the most common, and my favorites now almost the only thing I buy is the star sapphire, opal, color changing gems.
What is # 1 on the wish list is a green star sapphire and star opal with greenish / star ,, but it is not easy to find at reasonable prices since it is only completely untreated natural stones, which may be of interest in that case .. How has it come rust on th trapiche, although it is iron in sapphires but not so they rust;) haha, do you know of oxalic acid, try to get a little one, but dilute it by about 1/20 and let the sapphire soak, well, it may take several days, depending on the voice how much rost..en regular toothbrush can also help to o with a little toothpaste on, it is usually a mild abrasive in toothpaste ,, and you know the sapphire is probably the gemstone that can withstand the most and it applies to both management and eg the cleanings acids mm. but it is rough stones, then of course the matrix to be influenced, but makes it a habit to use twice as mkt. water than recommended better to let it take longer ok ,, good luck
Ps.are u sure that they not are treated .. specially sapphire trapiche is extra,extra rare to find whit sutsch nice color as yours