Hi Vanessa and welcome to P-G.
Even when pearls are certified, there will always remain a level of subjectivity. The certificate does not mention species, other than as a non nacreous clam pearl. As there is a flame pattern present, I'll assume it's Tridacna. Pearls from giant clams are not uncommon.
For a natural pearl to fetch high value, it's essential to have outstanding qualities. Although this pearl has relatively good shape, a clean surface and is quite sizeable, it's lacks luster and orient. As such, pearls of this type do not necessarily move very well.
Over the years, I've seen several non nacreous clam pearls for sale upwards of $100 per carat, but they rarely sell. This would include quahog pearls, which often have stunning color and near-round shape. Most finders inevitably retain them as keepsakes or fashion them into interesting pieces of folk art. This piece would be a good candidate for a value-add along these lines, but the market would be limited.
It's certainly wise to ask around before buying or selling natural pearls and I thank you for sharing it with us. It's always a pleasure to see natural pearls.