After, come on back and tell us what you are thinking about size, color intensity, treatment, etc. an I'm sure we'll have ideas to share - we always do
Fancy vivid? That term is more commonly used with coloured diamonds rather than coloured gemstones. I guess you just want a pink sapphire of very strong to vivid saturation? Why 0.51 ct specifically?
I'm trying to make a specific piece, the ring it's modelled of has a .41 trillion however it could still fit a
51 or so. Were having trouble finding untreated sapphires. There seems to be a debate about what is 'treated' vs untreated.
No debate! Anything that is natural without any treatment is natural. Anything that has been treated (and with sapphires there are lots of different treatments) is a treated stone. The least concerning of all treatments is heating and some people accept that BUT many different vendors do not declare treatments. Please read the stickies at the top of this forum that Minou has linked to as it gives you a fuller explanation of treatments so you know what you're prepared to accept. Coloured stones are a million miles away from diamonds (which are relatively easy to buy) so if you're more used to buying diamonds (and I suspect you are by the terminology you're using), you will, unfortunately, have to relearn and what you'll find is that buying coloured stones is nightmarish (but fun)!
In terms of colour, a vivid pink stone can have purple, orange, red tone etc. If you have an example of the colour you want that would be helpful.
Also, please don't shop looking for carat weights. The dimensions of the setting are a far better indication because a .51 stone could be shallow cut and face up big so might not fit your setting. There will be very few calibrated pink sapphire stones cut in a trillion cut.
Lastly, trillions are not common (even in heavily treated stones) but not in their more natural counterparts.
All of the above sounds negative but you have asked to search for something incredibly specific and I just wanted to point out how problematic that could be. HTH
I would shop by the measurement since carat weight will net you too many different sizes. Trilliants are very uncommon. Add that you want a specific colour and size makes this a long and challenging search. Add untreated to the mix and you could be searching for years.
Luckily you are looking for small stone, so that should make things a bit easier.
You might consider contacting a custom cutter to see if they could find a stone that is currently slightly larger than what you are looking for of the right color and have it cut to the smaller size trillion.
This would necessitate you having a robust budget and possibly paying more for the stone than it will ultimately be worth. Going this route might require to buy a larger stone than you need to yield possibly a much smaller stone, meaning you are devaluing it. But its something to consider if you have the budget.
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