Hello! My husband and I found my Great Grandma's pearl necklace. We did the "tooth test" and it is gritty feeling. There are individual knots in between each pearl. There are a total of 73 pearls with the smallest being 5mm and the largest is 10mm. It has a beautiful clasp that has 10KM on it. It is about 23 inches long from clasp to clasp. We would really like to know an approximate value of this necklace. I know that nobody can give us a true appraisal/value from just a picture, however we would like to know if it is worth our time to take it to a reputable jeweler. Thank you!