A Large Unmounted " Diamond"
the brilliant-cut stone stated to weigh 105ct, stated to measure 33mm x 22mm.

Stated Quality
Color: D (Colourless)
Clarity: VVS1 (Very Very Slightly Included)

Valued on basis of being GIA certificated D VVS1 with graining

The stone appears slightly yellow in the photo but perhaps poor lighting. If it is in fact a natural diamond, once again it is impossible to sell without first obtaining a GIA gem diamond certificate to prove that it's natural and the quality as per the 4 C's.

Happy to review values once a GIA certificate is obtained.

Valuation is based on being a treated white diamond

https://www.gia.edu/