All Tanzanite Stones are Heated to 400 C to stabilizer/Improve color. In General This Treatment is not detectable and known as standard treatment. There is no dance manite with howhout Heat Treatment. You can collect articles up to 15 days to save postage. Onlyonce Shipping costs. To save on shipping, you can combine items up to 15 days. We charge only one time shipping. Smallest Inclusion with free Eye very very difficult recognizable / Very small inclusion (s), very difficult to see by Eye Very small inclusions with free eye difficult to recognize / some inclusion (s), difficult to see by eye Small Inclusion with free Eye recognizable / Inclusions are readily visible but brilliance of stone is not effected Including, recognizable inclusions may also reduce the brilliance of the stone / i.