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Never heard of that site before but if they can't even be bothered to write their terminologies correctly, this raises a flag.
The clarity is usually referred to as SI1 or SI2, not I1/I2. Haven't heard of IGL certification before, but a quick search tells me that they grade their diamonds one or two grades higher; on an already shitty rock. And who the fuck sells diamonds with generalized specs? If you're comfortable buying on those terms, boy do I have a deal for you.
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