HollywoodLife.com posted a closeup of the gaudy diamond ring, with an appraiser estimating its value at upward of $750,000.
There is no source for that valuation beyond Bernie, no appraiser's opinion attached.
c.1400, "to set a value on," from stem of Old French aprisier "apraise, set a price on" (14c., Modern French apprécier), from Late Latin appretiare "value, estimate," from ad- "to" (see ad-) + pretium "price" (see price (n.)). Original English spelling apprize altered by influence of praise. Related: Appraised; appraising.