what registry are you using i wonder
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At enom you can reg fake.diamonds for only $370 ……crazy
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Dynadot.
It (.diamonds) was $150 EAP, $40 renewal (it's considered a premium). This is the only early one I have registered.
The one-letter ones are $240 (EAP) at Dynadot, $349 at Go Daddy. Not biting on those, though.
The one-letter ones seem to be more like vanity domains (I have two in .estate) and will not be all that rare, once the other gTLDs start rolling out.
IMHO, the best .diamonds keywords will be color descriptive of diamonds: yellow, blue, red, pink, colorless, etc. Most, if not all, of these are gone or reserved. White.diamonds is nice (and registry reserved), but there is a well-known TM on that term (perfume); besides, I think "colorless" is the standard term for a clear gem.
Champagne (brown) diamonds are heavily marketed to middle-class buyers -- at one time, they were considered "junk" or industrial diamonds, but a clever marketer found a way to make them desirable and appealing. The natural brown (a.k.a Champagne and Chocolate, depending on saturation of colors) diamonds are somewhat rare, so most of the ones sold are irradiated or heat treated, which is accepted in the industry.
From a business standpoint, I like Champagne better than the other colors simply because a yellow or blue diamond market is smaller (albeit richer) than the Champagne market -- I see Champagne diamonds advertised a lot, so much so that I originally thought it was TM'ed (it's not).
I can't think of any other .diamonds domains I would want, though. If end users adopt this gTLD, I can see jewelry stores specializing in diamonds registering their company names -- although .jewelry would be a better choice.
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