Final answer:
Marcus must use the taxpayer-use test and purchase the qualified replacement property before the end of this year for his realized gain to not be recognized under Section 1033.
Step-by-step explanation:
Marcus must use the taxpayer-use test and purchase the qualified replacement property before the end of this year for his realized gain to not be recognized under Section 1033. The taxpayer-use test requires that the replacement property be similar or related in service or use to the property that was lost or destroyed.
In this case, Marcus must purchase another ring that is valued at $19,000 or more to match the FMV of the stolen ring. By doing so, his realized gain of $4,000 will not be recognized for income tax purposes.