Sukriti after graduation from MIT Sydney has been working as an accountant at Best Accountants since July 2015. She married Rajib in August 2016 who at that time had been working as the Chief Financial Officer at Sydney Finance Miracle. On their first wedding anniversary, Rajib promised to buy a diamond necklace for Sukriti. However, Rajib lost his job immediately before the anniversary and as a result could not carry out his promise to Sukriti. Since then their relationship started deteriorating. In December 2018, they agreed to end their relationship by way of divorce and as required by law, since then they have been living separately. In the meantime, while Rajib was going through financial hardship early this year, Sukriti lent him AUD$10,000 upon Rajib's promise to repay the loan within a month.

Required:

Advise Sukriti whether she can enforce Rajib's promise to buy her a diamond necklace and to repay the loan could be enforced under Australian contract law. Refer to relevant case laws in support of your answer.