Up for sale is a natural yellow / blue coticule. In other words: the combination yellow / blue is occurring because it was cut from a piece of strata that just happened to be bbw on one side, and yellow coticule on the other side. Stones like these are uncommon.

Both sides can be used, same as if you had a belgian blue stone and a separate yellow coticule.
The stone is 4 cm wide ( just over 1.5") and 18 cm long (over 7")
It is lapped, and the edges are chamfered.
Onf ot the cornershad a small chip that I sanded smooth.

Price with shipping included, worldwide, is 150 USD or best offer.

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